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United States Court of Appeals,First Circuit.

Richard Charles WHALLON, Jr., Petitioner, Appellee v. Diana LYNN, Respondent, Appellant.

No. 00-2041.

Decided: October 27, 2000

Before LYNCH, Circuit Judge, COFFIN, Senior Circuit Judge, and LIPEZ, Circuit Judge. Barry S. Pollack, with whom Dechert Price & Rhoads, Todd & Weld, Elaine M. Epstein, Gary O. Todd, and Charlene A. Caldeira were on brief for appellant. Mary A. Azzarito, with whom Tucker and Cinquegrana, Stephen J. Cullen, and Miles & Stockbridge were on brief for appellee.

In May 2000, Richard Charles Whallon, Jr. petitioned for the return of his five-year-old daughter, Micheli Lynn Whallon King, to Mexico pursuant to the Hague Convention on the Civil Aspects of International Child Abduction.   See Hague Convention on the Civil Aspects of International Child Abduction, T.I.A.S. No. 11,670, 19 I.L.M. 1501 (1980).1  Micheli had been taken by her mother, Diana Lynn, from Mexico, where all three had lived, to Massachusetts.   Lynn says that she was entitled to do so, inter alia, because Whallon never had the type of “rights of custody” as to Micheli that are protected by the Convention.   The parties agree that this in turn requires an inquiry into what rights under Mexican law an unmarried parent (here Whallon) has under the doctrine “patria potestas,” a doctrine with ancient roots in Roman law.

We conclude that Whallon has established that he has protectable rights of custody under the Convention, that he did not acquiesce in Micheli's removal, and that Micheli does not fall within the exception to the Convention for situations where there is a grave risk that the child's return would expose the child to physical or psychological harm or otherwise place the child in an intolerable situation.   We affirm the district court's order that Micheli must be returned to Mexico, her country of habitual residence.   If Whallon and Lynn then wish to dispute who has what custody over Micheli or where Micheli should live, those disputes may be heard in the Mexican courts.


Micheli was born in Mexico on July 4, 1995.   Micheli's parents, Diana Lynn and Richard Charles Whallon, Jr., both American citizens, never married, and they separated towards the end of 1995.   Micheli lived with her mother and her half-sister Leah in Cabo San Lucas, Baja California Sur, Mexico.   Following the separation, Whallon continued to spend time with Micheli.   At no time did Whallon and Lynn enter into a formal custody agreement;  neither has sought a custody determination as to his or her own status.

Lynn alleged that Whallon performed only a limited parental role and provided only sporadic child support during the last two years all three of them were in Mexico.   Additionally, Lynn accused Whallon of subjecting her and Leah to significant verbal abuse and of allowing matters to escalate to physical violence against Lynn herself.   Lynn made no such claim that Whallon acted that way towards Micheli.

In fact, the record reflects that Whallon was significantly involved in his daughter Micheli's life.   From the time of Micheli's birth, Whallon saw her on an almost daily basis.   And from the time Micheli was three years old, she spent every other weekend, overnights, with Whallon.   Indeed, in August 1997, Whallon moved to within one hundred yards of where Lynn and Micheli lived to be closer to Micheli.   Whallon also paid Lynn at least $500 of child support for Micheli each month, money that was used to pay for dental and medical work for Micheli.   Whallon did the types of things that one generally expects an attentive and mindful parent to do:  driving Micheli to and from nursery school every day for almost two years;  buying Micheli clothes;  helping her with homework and art projects;  attending various school activities;  and taking Micheli to the doctor when she was sick.   Additionally, Whallon took Micheli-with Lynn's approval-to San Diego for medical and dental appointments and to Arizona in 1998 to meet Micheli's paternal grandfather.

In late September 1999, Whallon learned that Lynn was planning to take Micheli with her to Texas to visit Lynn's parents.   Whallon filed a petition in the court of the State of Baja California Sur in Mexico to permanently deprive Lynn of all custody rights over Micheli and to grant him all such rights.   The Mexican court eventually denied the petition in April 2000, concluding that Whallon had failed to establish the imminent danger, absolute abandonment, or sort of corruption or mistreatment required to terminate a mother's custody of a child under seven years of age.   In the interim, Whallon's attorney attempted to block the departure of Lynn, Micheli, and Leah. As a result, there was an ugly incident in which Lynn and the two children were held at gunpoint at the airport until a high-level official enabled Lynn and her daughters to leave.   Whallon, however, denies ever having instructed his attorney to order gunmen to prevent their departure or having any prior knowledge that the gunmen had been hired.   On October 1, 1999, Lynn took Micheli and Leah with her to the United States.   Whallon then petitioned the district court in Massachusetts for Micheli's return to Mexico.


Following a two-day evidentiary hearing, the district court granted the petition and then denied respondent Diana Lynn's motion for a stay pending appeal.   The district court reasoned that under the Hague Convention Lynn had physical custody over Micheli but that Whallon also exercised “rights of custody” over Micheli within the meaning of the Convention.   Specifically, the court found that Whallon exercised patria potestas rights, a concept of parental custody rights distinct from physical custody rights on the one hand and mere visitation rights on the other.   Accordingly, it concluded that Lynn's removal of Micheli violated Whallon's actual exercise of rights of custody under Mexican law, and was thus wrongful under the Convention.

The district court also determined that Lynn did not qualify for the exception to the Convention's return requirement that applies where there is a grave risk that the child's return would expose her to physical or psychological harm or otherwise place her in an intolerable situation.   The district court considered the alleged pattern of verbal abuse against Lynn and Leah. It also took account of the alleged pattern of physical abuse against Lynn herself, including an altercation in January 1999 in which Whallon allegedly pushed Lynn as she was departing with Micheli and then threw a rock in the direction of Lynn's car.   Additionally, the court considered the substantially more serious and violent incident in which armed gunmen waylaid Lynn and her two daughters while they were en route to the airport.   Although the district court found these incidents regrettable, it noted that none was directed at Micheli and concluded that they did not amount to the kind of grave risk of physical or psychological harm required to trigger the exception.   The court also found no risk that Whallon would disregard the order of a court, whether Mexican or American.

On September 15, 2000, this court granted a stay of the district court's order, required that Whallon have reasonable access rights to Micheli, and ordered an expedited appeal.


Lynn makes a number of arguments, and we outline the essence of them.   First, she argues that her removal of Micheli was not wrongful under the Convention because Whallon did not establish that he possessed any rights of custody under Mexican law, and the district court wrongly placed the burden on her to disprove he had any such rights.   Second, Lynn contends that the district court failed to make the necessary factual findings in considering the exception to the return provisions of the Convention where such return would subject a child to a grave risk of physical or psychological harm, or otherwise place the child in an intolerable situation.   Finally, Lynn maintains that the district court erred in failing to recognize the existence of an affirmative defense under the Convention where the party seeking return (Whallon) had previously acquiesced in the removal.

 We review the district court's factual findings for clear error and its interpretation of the Convention de novo.   See Walsh v. Walsh, 221 F.3d 204, 218 (1st Cir.2000);  Friedrich v. Friedrich, 78 F.3d 1060, 1064 (6th Cir.1996).

A. Wrongful Removal

The Hague Convention seeks “to protect children internationally from the harmful effects of their wrongful removal or retention and to establish procedures to ensure their prompt return to the State of their habitual residence, as well as to secure protection for rights of access.”  Hague Convention, preamble, 19 I.L.M. at 1501.   Under Article 3 of the Convention, the removal or retention of a child is wrongful if:

(a) it is in breach of rights of custody attributed to a person, an institution or any other body, either jointly or alone, under the law of the State in which the child was habitually resident immediately before the removal or retention;  and

(b) at the time of removal or retention those rights were actually exercised, either jointly or alone, or would have been so exercised but for the removal or retention.

Id. art. 3, 19 I.L.M. at 1501.2  The petitioner bears the burden of proving “wrongful removal” by a preponderance of the evidence.  42 U.S.C. § 11603(e)(1).   If the petitioner demonstrates that the child was wrongfully removed, the court must order the child's return to the country of habitual residence unless the respondent demonstrates that one of four narrow exceptions applies.   Id. § 11601(a)(4).

Micheli's place of habitual residence at the time of her removal was Cabo San Lucas, Mexico and she was indeed removed by Lynn, facts agreed on by all.   The central issues are whether Whallon has “rights of custody” over Micheli under the Convention and, if so, whether he was actually exercising those rights prior to her removal.   The parties agree that our determination of Whallon's rights of custody rests, as it must, on our understanding of relevant Mexican law, the principles underlying the Hague Convention, and the record in this case.   Whether Whallon has the requisite custodial rights is an issue of law.

1. Whether Whallon has Rights of Custody under the Convention

The Hague Convention states that rights of custody “shall include rights relating to the care of the person of the child and, in particular, the right to determine the child's place of residence․”  Hague Convention, art. 5(a), 19 I.L.M. at 1501.   The Convention then contrasts “rights of custody” with the far more limited “rights of access,” which include “the right to take a child for a limited period of time to a place other than the child's habitual residence.”  Id. art. 5(b), 19 I.L.M. at 1501.   It reserves the remedy of return solely for violations of rights of custody.3

While the Hague Convention itself provides no further definition of the term “rights of custody,” and deliberately so,4 courts have commonly looked to the background report of the Convention for further guidance.   See, e.g., Walsh, 221 F.3d at 217.   That report states that “the law of the child's habitual residence is invoked in the widest possible sense,” and that the sources from which custody rights derive are “all those upon which a claim can be based within the context of the legal system concerned.”   Explanatory Report, ¶ 67, at 446.5  The Report also states that the Convention favors “a flexible interpretation of the terms used, which allows the greatest possible number of cases to be brought into consideration.”  Id.

Two important and closely related principles underlying the Hague Convention also inform our approach here.   First, a court deciding a petition for return of a child plainly has jurisdiction to decide the merits of a wrongful removal claim, but it may not decide the merits of the underlying custody dispute.   See Hague Convention, art. 19, 19 I.L.M. at 1503 (“A decision under this Convention concerning the return of the child shall not be taken to be a determination on the merits of any custody issue.”);  42 U.S.C. § 11601(b)(4).   Second, the Convention is generally intended to restore the pre-removal status quo and discourage a parent from crossing international borders in search of a more sympathetic forum.   See Walsh, 221 F.3d at 218-19;  Blondin v. Dubois, 189 F.3d 240, 246 (2d Cir.1999);  Friedrich, 78 F.3d at 1064.   As the Explanatory Report instructs:

[F]rom the Convention's standpoint, the removal of a child by one of the joint holders without the consent of the other, is ․ wrongful, and this wrongfulness derives in this particular case, not from some action in breach of a particular law, but from the fact that such action has disregarded the rights of the other parent which are also protected by law, and has interfered with their normal exercise.   The Convention's true nature is revealed most clearly in these situations:  it is not concerned with establishing the person to whom custody of the child will belong at some point in the future, nor with the situations in which it may prove necessary to modify a decision awarding joint custody on the basis of facts which have subsequently changed.   It seeks, more simply, to prevent a later decision on the matter being influenced by a change of circumstances brought about through unilateral action by one of the parties.

Explanatory Report ¶ 71, at 447-48.

 Thus, to assess whether Whallon possesses “rights of custody” under Article 5 of the Convention, the court must not simply look to the relevant provisions of Mexican law but also must interpret those provisions in light of the Convention's basic principle that a child's country of habitual residence is best placed to decide upon questions of custody and access, unless an exception applies.  Id. ¶ 34, at 434-35.

 The law of the State of Baja California Sur, the place of Micheli's habitual residence, is the relevant source of law here.   See Hague Convention, art. 3, 19 I.L.M. at 1501.6  That poses its own difficulties for a court of the United States, a court which comes from a different legal tradition.   Care must be taken to avoid imposing American legal concepts onto another legal culture.   Differently from many laws in this country, Mexican law appears to embody two concepts of importance here.   The first is a preference in divorce cases toward placing what is called “custody” of a child under age seven with the mother.   That preference is negated in “exceptional cases” such as those involving “serious and contagious illness, vice, mistreatment or desertion.”   Codigo Civil del Estado de Baja California Sur (“Civil Code”), art. 322.   The preference is embodied in the Civil Code, and while it applies specifically to divorces (and there has been no divorce here since there was never a marriage), the Mexican court looked to this provision in informing its decision about whether to terminate Lynn's custodial rights.   And so we find that maternal preference, as well as the Code's use of the term “custody,” relevant to our determination of whether Whallon has rights of custody under the Convention.

The second concept is embodied in the doctrine of patria potestas,7 and represents a more generalized concept of parental authority.   Although historically the doctrine protected the father's rights as to the child, originally absolute rights under Roman law, the Baja California Sur Civil Code refers to it as encompassing the rights of both parents.   Article 474 provides generally that patria potestas, or parental authority, “is understood to mean the relationship of rights and obligations that are held reciprocally, on the one hand, by the father and the mother or in some cases the grandparents and, on the other hand, the minor children who are not emancipated.”   Civil Code, art. 474.   The concept of patria potestas is defined broadly:

Paternal authority is exercised over the person and the property of the children subject to it.   The purpose of its exercise is the comprehensive physical, mental, moral and social protection of the minor child, and it includes the obligation for [the child's] guardianship and education.

Id. art. 479.   Additionally, those exercising patria potestas “have the obligation to comport themselves in a manner that sets a good example for the children and shall teach them appropriate standards of social interaction.”   Id. art. 486.

The Civil Code explicitly discusses patria potestas rights in situations where, as here, the parents of a child born outside of wedlock separate.   It provides that in such situations, “both [parents] shall continue to exercise paternal authority.”   See id. art. 478 (emphasis added).   The Code then distinguishes patria potestas from “custody,” which may be decided by agreement or, failing such agreement, by a judge.  Id. Indeed, the existence of divisible custody rights under Mexican law-i.e., of physical custody and patria potestas is entirely consistent with the Hague Convention's statement that custody may be held “jointly or alone.”   Hague Convention, art. 3, 19 I.L.M. at 1501;  Explanatory Report ¶ 71, at 447-48 (characterizing joint custody as “dividing the responsibilities inherent in custody rights between both parents”);  see also Croll v. Croll, 229 F.3d 133, 139 (2d Cir.2000) ( “rights of custody” under Convention “references a bundle of rights exercised by one or more persons having custody”).8

Lynn says that Whallon's patria potestas rights are closer to what the Convention means by “rights of access” than to what it means by “rights of custody.”   We disagree.   Article 329 of the Civil Code states that “[i]ndependently of who exercises patria potestas or custody, the relatives obliged by law to provide support have the right to visit their descendants or collateral relatives, and to have an adequate communication with them.”   Civil Code, art. 329.   Thus, patria potestas, like physical custody, plainly means something “independent” from mere visitation rights.   Importantly, the Code describes these visitation rights in terms of “adequate communication,” id., but describes patria potestas rights through the stronger language of “adequate connection,” id. art. 323, which implies a meaningful, decisionmaking role in the life and care of the child, and not the mere access to the child associated with visitation rights.9

 Additionally, Whallon submitted into evidence the affidavit of Mexican attorney Omar Quijano Martinez further corroborating that both parents exercise patria potestas rights over a child under Mexican law and stating that both parents must consent to the removal of such child under Mexican law.   Such affidavits are an acceptable form of proof in determining issues of foreign law, see Rule 44.1, Fed.R.Civ.P., and are likewise permitted under the Hague Convention, see Explanatory Report ¶ 101, at 456-57 (“proof of the substantive law of the State of the child's habitual residence may be established by either certificates or affidavits”).

Lynn also relies heavily on the decision of the Mexican court rejecting Whallon's petition to terminate her parental rights.   That decision, however, has limited relevance to this action.   At issue in the Mexican court action was whether Whallon had demonstrated the necessary exceptional circumstances to terminate Lynn's custodial rights.   Although the Mexican court concluded that Whallon had not met his heavy burden, it never stated or even suggested that Whallon lacked custody rights or otherwise determined what those custody rights were.   Whether or not a Mexican court ultimately decides the matter of custody differently following Micheli's return to Mexico, Whallon did possess rights of custody under the law of Micheli's habitual residence at the time of her removal.10

Finally, Lynn contends that the district court, though acknowledging at trial that Whallon had the burden of proof to establish a wrongful removal, failed to acknowledge that burden in its written opinion and failed to impose that burden on Whallon in its analysis.   This argument fails.   The district court approached the issue of wrongful removal by first considering Whallon's arguments regarding patria potestas rights under Mexican law.   After closely analyzing the relevant provision of Baja California Sur's Civil Code and Lynn's counter-arguments, the court concluded that there had been a wrongful removal.   It acknowledged that Whallon had the burden of proof on this issue, weighed the burden in light of the law and evidence presented, and found that the burden had been satisfied.

In sum, the evidence of patria potestas rights under Mexican law leads us to conclude that Whallon's rights were “rights of custody” under the Convention.   While Lynn had actual custody of Micheli, both parents exercised patria potestas rights over Micheli.   Indeed, to date no Mexican court has given Lynn exclusive custody or denied Whallon patria potestas rights over Micheli.   The pending Massachusetts custody proceedings commenced by Lynn after her removal of Micheli are inapplicable to this action because the Convention refers specifically to (Whallon's) rights of custody at “the time of removal.”   Hague Convention, art. 3(b), 19 I.L.M. at 1501;  see also Beaumont & McEleavy, Hague Convention, at 53 (subsequently rendered custody orders inapplicable to return proceedings).

2. Whether Whallon Actually Exercised Rights of Custody

 Lynn argues that Whallon was not “actually exercising” his rights of custody over Micheli at the time of her removal by Lynn, as required by the Convention.   See Hague Convention, art. 3(b).   Here, there is no question that Whallon was actually exercising his rights of custody prior to Micheli's removal, as the description of the facts of this case makes amply clear.   Accordingly, Lynn's removal of custody violated Whallon's rights of custody under the Convention.

B. Exception for Grave Risk of Physical or Psychological Harm

 Lynn argues that Micheli should still not be returned to Mexico because she falls within the exception to return contained in article 13(b) of the Convention.

The wrongful taking of a child from his or her country of habitual residence normally requires the child's return.   See Hague Convention, art. 12, 19 I.L.M. at 1502.   Courts, however, are “not bound to order the return of the child if the person, institution or other body which opposes its return establishes that ․ there is a grave risk that his or her return would expose the child to physical or psychological harm or otherwise place the child in an intolerable situation.”  Id. art. 13(b), 19 I.L.M. at 1502.   A respondent who opposes the return of the child by asserting the article 13(b) exception has the burden of proving this exception by clear and convincing evidence.   See 42 U.S.C. § 11603(e)(2)(A);  Walsh, 221 F.3d at 217.   The article 13(b) exception is a narrow one.   See 42 U.S.C. § 11603(a)(4);  Walsh, 221 F.3d at 217.

 To meet her burden under the article 13(b) exception, the respondent must establish that the alleged physical or psychological harm is “a great deal more than minimal.”  Walsh, 221 F.3d at 218.   Indeed, the harm must be “something greater than would normally be expected on taking a child away from one parent and passing him [or her] to another.”  Id. (internal quotation marks omitted).   Courts are not to engage in a custody determination or to address such questions as who would be the better parent in the long run.   Id.

We previously addressed this exception to the Convention in Walsh, supra.   In Walsh, we reversed the decision of the district court and held that the respondent wife had demonstrated by clear and convincing evidence that the return of her children to Ireland posed a grave risk of physical and psychological harm.   See id. at 219-21.   In Walsh, the husband had severely beaten his wife over the years, including when she was pregnant.   Many of the beatings took place in front of her two small children, as did a beating of his older son by another marriage.   The husband fled this country when charged with threatening to kill another (a neighbor), refused to return when a fugitive warrant was entered, and violated Irish court orders that he stay away from the marital residence.  Id. at 209-12.   We found that the district court “inappropriately discounted the grave risk of physical and psychological harm to children in cases of spousal abuse;  ․ failed to credit [the petitioner father's] more generalized pattern of violence, including violence directed at his own children;  and ․ gave insufficient weight to [the petitioner father's] chronic disobedience of court orders.”   Id. at 219.   Such a high quantum of risked harm barred the child's return under article 13(b).  Id.

Here, by contrast, the district court found that the alleged instances of verbal abuse of Lynn and her older daughter Leah, and of physical abuse of Lynn, while regrettable, neither were directed at Micheli nor rose to the level of the conduct of the petitioner father in Walsh. We agree.   Lynn's allegations of verbal abuse and an incident of physical shoving are distinct from the “clear and long history of spousal abuse” presented in Walsh.   Id. at 220.   Lynn has never alleged that Whallon abused Micheli, either physically or psychologically.   Indeed, while the two experts who testified disagreed as to whether returning Micheli to Mexico would expose her to a grave risk of physical or psychological harm or otherwise place her in an intolerable situation, they both agreed as to the love that Whallon and Micheli have for each other as father and daughter.   As to the deplorable attempt to keep Lynn and Micheli in Mexico at gunpoint, the district court found credible Whallon's denial that he ever instructed his attorney to hire the gunmen or knew that the gunmen had been hired.   Furthermore, in contrast to Walsh, there is no evidence that Whallon would disregard an order of the court, whether Mexican or American.

Lynn argues that the district court ignored the psychological harm prong of article 13(b).   That is not so.   The court considered the alleged psychological harm to Micheli from the abuse and correctly found that any such harm did not to rise to the level required for sustaining an article 13(b) exception.   See Walsh, 221 F.3d at 218-19.   Lynn also contends that the district court ignored the harm resulting from the separation of Micheli from her half-sister Leah. Whether there is a separation is Lynn's choice.   She may return to Mexico with both her daughters.   We do not doubt that a separation, if any, would cause difficulty.   The logic, purpose, and text of the Convention all mean that such harms are not per se the type of psychological harm contemplated by the narrow exception under article 13(b).   To conclude otherwise would risk substituting a best interest of the child analysis for the analysis the Convention requires.   This would undercut the Convention's presumption of return where rights of custody have been violated by wrongfully removing a child in situations where that child had a sibling who was not wrongfully removed.11

C. Failure to Recognize “Acquiescence” Defense

 Lynn argues that the district court erred in ignoring her other affirmative defense that Whallon had previously acquiesced in Micheli's removal to the United States.   See Hague Convention, art. 13(a), 19 I.L.M. at 1502 (return not required where person opposing return establishes that “the person ․ having the care of the person of the child ․ had consented to or subsequently acquiesced in the removal”).12  While Whallon does not literally come within these terms as the one “having care of the person or child,” we assume arguendo that Lynn may make an acquiescence argument, at least in terms of whether the removal was in fact wrongful.   Lynn must prove acquiescence by a preponderance of the evidence.  42 U.S.C. § 11603(e)(2)(B).   Lynn argues that she repeatedly told Whallon that she would eventually be taking Micheli to the United States for her education but that Whallon failed to institute any formal custody proceedings in Mexico until after he had learned that Lynn was planning to remove Micheli.   Lynn also points to a note written by Whallon sometime in 1997 in which Whallon purportedly acknowledged that Lynn could relocate with Micheli to the United States as along as Micheli flew back to Mexico during a few holidays each year.

We find no acquiescence by Whallon in Micheli's removal here.   Whallon's failure to institute formal custody proceedings does not itself constitute acquiescence.   Indeed, a similar argument may be turned against Lynn:  that her failure to seek a formal custody declaration from the Mexican courts indicates her own acceptance of Whallon's custody rights, including, but not limited to, the right to determine Micheli's place of residence.   The 1997 handwritten note on its face does not constitute a waiver by Whallon of his custody rights.   The argument also fails to take account of the subsequent period during which time Whallon played an increasingly important role in Micheli's life, and is countered by Whallon's prompt and persistent actions seeking Micheli's return to Mexico following her removal.13


The decision of the district court is affirmed and the stay entered by this court on September 15, 2000 is lifted.   So ordered.


1.   The Hague Convention is implemented by the International Child Abduction Remedies Act (“ICARA”).   See 42 U.S.C. § 11601 et seq.

2.   Whallon alleged only wrongful removal, and not wrongful retention.

3.   While the Hague Convention provides remedies for a violation of access rights, see id., art. 21, 19 I.L.M. at 1503, such remedies do not include an order of return to the place of habitual residence.   Rather, such remedies include, inter alia, ordering that the custodial parent who removed the child from the child's habitual residence reimburse the other parent for expenses incurred in exercising his or her rights of access.   Id. art. 26, 19 I.L.M. at 1503-04.

4.   This provision was deliberately left vague due to the drafters' failure to agree on a more precise definition.   See Elisa Perez-Vera, Explanatory Report:  Hague Conference on Private International Law ¶ 84, in 3 Acts and Documents of the Fourteenth Session 426, 451-52 (“Explanatory Report”) (“[S]ince all efforts to define custody rights in regard to [particular situations] failed, one has to rest content with the general description given [in the text].”).   States, however, might wish to take the principles of the Convention into account when redrafting national legislation on custody matters.   See Paul R. Beaumont & Peter E. McEleavy, The Hague Convention on International Child Abduction 49 (1999).

5.   Elisa Perez-Vera served as “the official Hague Conference reporter for the Convention,” and her explanatory report “is recognized by the Conference as the official history of and commentary on the Convention and is a source of background on the meaning of the provisions of the Convention.”   See Hague International Child Abduction Convention;  Text and Legal Analysis, 51 Fed.Reg. 10494, 10503 (1986);  accord Shalit v. Coppe, 182 F.3d 1124, 1127-28 (9th Cir.1999).  “Because a treaty ratified by the United States is not only the law of this land ․ but also an agreement among sovereign powers, we have traditionally considered as aids to its interpretation the negotiating and drafting history (travaux preparatoires) and the postratification understanding of the contracting parties.”  Zicherman v. Korean Air Lines Co.,Ltd., 516 U.S. 217, 226, 116 S.Ct. 629, 133 L.Ed.2d 596 (1996).

6.   The parties agree that Mexican choice of law rules require that Mexico apply the law of the State in which the child was habitually resident immediately prior to the child's removal, i.e., the law of Baja California Sur. Cf. Shalit, 182 F.3d at 1128-29 (stating that Hague Convention's references to the “ ‘law of the State in which the child was habitually resident’ ” includes “the conflict of law rules of [that State]”).   While the parties hotly contest the nature of rights of custody under the law of Baja California Sur, they do not dispute that law's applicability to this case under Mexico's choice of law rules.

7.   Patria potestas is a concept derived from Roman law and originally meant paternal power.   It referred to a father's “near absolute right to his children, whom he viewed as chattel,” a right with which courts were powerless to interfere.   Kathryn L. Mercer, A Content Analysis of Judicial Decision-Making:  How Judges Use the Primary Caretaker Standard to Make a Custody Determination, 5 Wm. & Mary J. Women & L. 1, 14 (1998);  see also Black's Law Dictionary 1188 (7th ed.1999) (defining patria potestas as “[t]he authority held by the male head of a family over his children and further descendants in the male line, unless emancipated,” initially including “the power of life and death”).   In contrast, the Roman legal tradition did not provide wives with rights of parental authority.   See Sibylla Flugge, The History of Fathers' Rights and Mothers' Duty of Care, 3 Cardozo Women's L.J. 377, 383 (1996).In the Anglo-American legal tradition, the doctrine of patria potestas was eroded by the emergence in the seventeenth century of the conflicting doctrine of parens patriae, which recognized the state's interest in and responsibility for children.   See Mercer, A Content Analysis of Judicial Decision-Making,supra, at 14-15.  “Courts, as a second stakeholder, began to intervene in custody matters to protect the welfare of the child,” and became the “final arbiter of familial disputes” in the American colonies.  Id. at 15.   In the early nineteenth century, American courts began to award custody in accordance with the judicially determined best interests of the child.   In practice, however, this rejection of the paternal preference embodied in the patria potestas doctrine merely paved the way for the emergence of the maternal preference embodied in the tender years doctrine, which provided that a mother, unless shown to be unfit, deserved custody of young children in light of her unique maternal bond to her children.   See Amy D. Ronner, Women who Dance on the Professional Track:  Custody and the Red Shoes, 23 Harv. Women's L.J. 173 (2000).However, patria potestas appears to have followed a somewhat different path of development in legal traditions based on civil codes.   Cf., e.g., Flugge, The History of Fathers' Rights,, at 383 (discussing influence of patria potestas on Germany's code established in the nineteenth century).   Other Latin American countries with civil code traditions appear to recognize some form of patria potestas rights.  Pesin v. Rodriguez, 77 F.Supp.2d 1277, 1286 (S.D.Fla.1999) (noting, in Hague Convention case, that under Venezuela's code father and mother “ ‘are vested with the parental authority until a judicial decision establishes otherwise’ ” and that “father and mother who exercise parental authority have custody of their children ․ shall elect by mutual consent their place of domicile, residence or domicile [sic]”;  finding that mother's removal of child breached father's rights of custody under the Convention).   This case highlights the difficulties in imposing Anglo-American definitions of custody on legal systems, like Mexico's, that have different origins and traditions.   Baja California Sur's code suggests the continuing resilience of patria potestas rights (albeit in a diluted form) under Mexican law, despite the presumption that physical custody of children under age seven be awarded to the mother, at least in cases of divorce.

8.   The Convention allows the party seeking the return of the child to request that the central authority of a contracting State provide an explanation of its law.   See Hague Convention, art. 15, 19 I.L.M. at 1503.   Here, Whallon put into evidence a letter from the Mexican Central Authority for Child Abduction to the National Center for Missing and Exploited Children.   Although the letter contains significant factual mistakes-for example, it incorrectly refers to Lynn, an American citizen, as a German citizen-it nevertheless states that “patria potestas (custody) will be exercised by both parents” under Baja California Sur's Civil Code. The letter, however, takes no position as to whether patria potestas rights amount to custody rights under the Convention, nor does it reveal what question had been put to the Mexican Central Authority.   We give it little weight as a result.

9.   Lynn also relies on the Second Circuit's recent decision in Croll, supra, where the court held that the mother was not required to return the child to Hong Kong because she did not violate the father's rights of custody under the Convention.   In contrast to the situation here, in Croll there had been a clear determination of custody rights by a court of the country of habitual residence awarding sole custody to the mother and granting only rights of access to the father.  Id. at 134. Moreover, while the custody order in Croll contained a ne exeat clause prohibiting the child's removal from Hong Kong until she attained the age of eighteen years without leave of court or consent of the other parent, such clause represented only a negative right or veto, see id. at 139-40, as opposed to the affirmative grant of custody rights to Whallon under Mexican law and the ample evidence of Whallon's actual exercise of those rights.

10.   Lynn's reliance on Shalit v. Coppe,supra, is misplaced.   In Shalit, a wrongful retention case, the mother kept the child in Alaska after the child had come to visit her on a two-week vacation, despite an oral agreement-never approved by any court-that the child would live temporarily with the father in Israel.  Shalit, 182 F.3d at 1126.   The Ninth Circuit affirmed the district court's decision denying the father's return petition.   The court relied on the determination of an Alaska state court that predated the oral agreement and that granted the mother sole legal and physical custody.  Id. at 1130-31.   Here, by contrast, there has been no such judicial determination of custody.   Moreover, the law of Baja California Sur demonstrates the existence of rights of custody in Whallon.

11.   Furthermore, the cases on which Lynn relies for this argument involved the bonds between a child and her mother, not her sibling.   See, e.g., Steffen F. v. Severina P., 966 F.Supp. 922, 928 (D.Ariz.1997).

12.   The district court's opinion did not explicitly address this issue.

13.   In contrast, cases where courts have granted this affirmative defense have all involved clear instances of waiver by the party seeking the child's return.   Cf. Journe v. Journe, 911 F.Supp. 43, 47-48 (D.P.R.1995) (voluntary dismissal of underlying action for divorce and custody of children);  In re Ponath, 829 F.Supp. 363, 368 (D.Utah 1993) (petitioner failed, for almost six months, to make any meaningful effort to obtain return of the minor child).

LYNCH, Circuit Judge.

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