I. Introduction
               You have requested an opinion on whether the Mexican divorce obtained by G~ from his
                  first wife is valid under Pennsylvania law, and if so, whether Pennsylvania courts
                  would recognize the validity of the subsequent marriage between G~ and I~ based on
                  the doctrine of estoppel, and, therefore, entitling I~ to receive widow's benefits,
                  a disability insurance benefits (DIB) underpayment, and a lump sum death payment due
                  on G~'s record.
               
               II. Background
               As we understand the facts, G~, the deceased insured, died on May XX, 1995, while
                  domiciled in Pennsylvania. On August XX, 1959, B~ married G~ in a civil ceremony in
                  New York. G~ obtained a Mexican divorce from B~ on May XX, 1970. He appeared personally
                  at the proceedings in Mexico. B~ did not appear, but was represented by counsel after
                  having been served with the divorce papers and answering the complaint.
               
               G~ then married I~ in a civil ceremony on May XX, 1970. They separated (date unknown)
                  and G~ thereafter lived with B~ until his death in May 1995. B~ did not marry anyone
                  after her divorce from G~.
               
               B~ filed a DIB-after-death claim in May 1995, as well as a lump sum death claim and
                  a claim for the underpayment due on G~'s record ($4627). B~ was paid the $255 lump
                  sum benefit. Her claim for the underpayment, however, was denied in May 1997 because
                  of lack of evidence showing that she was the legal spouse of G~ at the time of his
                  death.
               
               I~ did not remarry after G~'s death. On November XX, 1995, she filed an application
                  for all benefits. She was awarded surviving divorced wife's benefits on the record
                  of her first husband, T~, effective November 1995. You have already determined that
                  I~ cannot qualify as a deemed spouse for benefits on G~'s record because she was not
                  living with him at the time of his death.
               
               The questions presented are whether the Mexican divorce is void under Pennsylvania
                  law, and what effects the validity or invalidity of the divorce has on I~'s status
                  for social security purposes, particularly her entitlement to the underpayment.
               
               III. Discussion
               Pursuant to § 216(h)(1)(A) of the Social Security Act, a claimant is considered to
                  be the widow of a deceased wage earner if the courts of the wage earner's domicile
                  at the time of his death would find that the claimant and the wage earner were validly
                  married when he died. In the absence of a valid marriage, eligibility may still be
                  found if the claimant has the same status respecting the devolution of intestate personal
                  property as a legal spouse. Since G~ died a Pennsylvania domiciliary, I~'s marital
                  status must be evaluated under Pennsylvania law.
               
               A. Validity of the Mexican Divorce Decree.
               Generally, a Mexican divorce decree will be recognized by Pennsylvania under the doctrine
                  of comity, unless it is shown to be invalid under Pennsylvania law. Thompson v. Yarnell, 169 A. 370, 373 (1933). In Pennsylvania, for a Mexican divorce decree to be invalid,
                  it must be shown not only that the respondent was not in Mexico at the time of the
                  proceedings, but that she was never properly served with process, was not represented
                  by counsel, and that the cause of action did not arise in the foreign jurisdiction.
                  Id. Furthermore, a prerequisite for judicial recognition of a foreign divorce is that
                  the party seeking the divorce must have resided in the state or country for a minimum
                  period of residency as determined by the local authority and the residency be accompanied
                  by domiciliary intent.
               
               Sargent v. Sargent, 307 A.2d 353 (1973).
               
               In our opinion, it appears that the Mexican divorce decree at issue was valid under
                  Pennsylvania law. B~ was served with process and she was represented by counsel in
                  the divorce proceedings. Moreover, there is no evidence, at this point, to suggest
                  that G~ did not satisfy the necessary residency requirements, or that his residency
                  was not accompanied by domiciliary intent. Indeed, presumably, G~ met the residency
                  requirements because the divorce decree was granted by the Mexican court. It is very
                  likely then, in the absence of any other facts, that a Pennsylvania court will find
                  the Mexican divorce valid. In fact, under Pennsylvania's Divorce Code today, the validity
                  of a divorce decree cannot be questioned in any court after the death of either party
                  to the proceeding, 23 Pa.C.S.A. § 3331.
               
               Accordingly, based on the above facts, it appears that Pennsylvania would recognize
                  the Mexican divorce as valid.
               
               B. B~ Estopped from Challenging the Divorce.
               Even if it could be established that the Mexican divorce is invalid under Pennsylvania
                  law, it appears that B~ would still be estopped from challenging its validity.
               
               In Lowenschuss v. Lowenschuss, 579 A.2d 377, 381 (1990), the Superior Court of Pennsylvania specifically held that
                  it was erroneous to decide first whether a divorce was valid and then whether the
                  subsequent marriage was valid. Rather, the Court stated that the proper approach is
                  to first consider whether the spouse is estopped from raising the issue of the validity
                  of the divorce and the present marriage. Id. If the spouse is estopped, the inquiry is at an end, and there is no need to determine
                  the validity of the divorce. Id.
               Pennsylvania courts have a long history of applying the doctrine of estoppel to a
                  wide variety of cases involving attacks on invalid divorces. See Diamond v. Diamond, 461 A.2d 1227 (1983) (holding that husband was estopped from challenging the invalidity
                  of a "mail order" divorce he obtained against wife); Rosen v. Sitner, 418 A.2d 490 (1980) (holding that a husband, who took advantage of a prior Mexican
                  divorce decree in order to marry his wife and having lived with her for seven years,
                  could not later assert the decree was invalid); Sargent v. Sargent, 307 A.2d 353 (1973) (holding that a wife is not estopped from challenging the validity
                  of Mexican divorce where she was not a party to the divorce).
               
               Several circumstances will call for the application of the estoppel doctrine. Lowenschuss, 579 A.2d at 382. For example, estoppel will usually be found when the divorce was
                  obtained by the very party attempting to attack it. Id. Estoppel may also be found where there has been a long acquiescence in the divorce
                  with knowledge of its jurisdictional defect and neither party has contested it. Id. Acceptance of benefits, usually alimony, will also often foreclose an attack, as
                  will remarriage after the defective decree, either by the person attacking the decree,
                  or by the other party. Id. Finally, the Divorce Code also recognizes that a party who has agreed to the procurement
                  of a divorce, or who is guilty of laches, is generally barred from making a collateral
                  attack upon the validity of the decree. 20 Pa.C.S.A. § 3333.
               
               In this case, there were several factors that could support a finding that B~ is estopped
                  from challenging the Mexican divorce. First, although she did not initiate the divorce
                  proceedings, it was clear that she participated in its procurement. She was aware
                  of the divorce proceedings in Mexico.
               
               She filed an answer to the divorce complaint, and she was represented in the proceedings
                  by an attorney.
               
               There was also a long period of acquiescence. The divorce was obtained in May 1970,
                  and to this date, over twenty-five years later, B~ has never challenged the validity
                  of the divorce. Furthermore, even though B~ never remarried after the divorce, G~
                  did marry I~ which indicated a belief, at least on G~ and I~'s part, that the Mexican
                  divorce was valid.
               
               Accordingly, there was sufficient evidence to suggest that Pennsylvania courts will
                  find B~ estopped from challenging the Mexican divorce.
               
               C. Second Marriage Is Presumed Valid.
               When evaluating the validity of a second or later marriage, Pennsylvania recognizes
                  two conflicting presumptions. In re Estate of Watt, 185 A.2d 781, 785-86 (1962). The first presumption is that a valid first marriage
                  continues until it is proven to be dissolved by death, divorce or annulment. Huff v. Director, Office of Personnel Management., 40 F.3d 35, 39 (3d Cir. 1994) (citing to Watt, 185 A.2d at 785-86). The second presumption presumes the innocence and validity
                  of a second marriage. Id. When there is a conflict in the presumptions, Pennsylvania courts perform a balancing
                  test to determine which of the two presumptions is more easily sustained by the evidence.
               
               Id.
               In applying Pennsylvania law, the Third Circuit rejected the theory that the first
                  marriage must be shown conclusively to have terminated before the second can be recognized. Huff at 40 F.3d at 42. See Cupler v. Secretary of Health and Human Servs., 252 F. Supp. 178 (1966) (holding that a marriage which went unchallenged during
                  the twenty-eight years both spouses lived and for nearly five more years after the
                  husband died was clothed with presumption of validity). Each case must be resolved
                  on the basis of its own facts and circumstances.
               
               In this case, based on the evidence thus far, we believe the presumption of continuance
                  of the marriage between G~ and B~ yields to the presumption of validity of the marriage
                  between G~ and I~.
               
               B~ was served with divorce papers. She answered the complaint and she was represented
                  in the divorce proceedings by an attorney. She does not deny the divorce. Moreover,
                  in the twenty-five years following the divorce, its validity has never been challenged.
                  A copy of the divorce decree is also in the claims file. Thus, there was a record
                  of the divorce. This was sufficient proof that the first marriage had been dissolved.
               
               Furthermore, as stated above, the fact that G~ married I~ only four days after his
                  divorce proved that both he and I~ believed the divorce was valid and that they had
                  the right to marry each other. Indeed, under New York law, which was where G~ and
                  I~ got married, the Mexican divorce would have been considered valid. See Rosen v. Sitner, 418 A.2d 490, 492 (1980) (holding that a Mexican divorce decree was valid under
                  New York law where one spouse appears personally and the other spouse submits to the
                  jurisdiction of the court by entering an appearance). That was the situation in this
                  case. Accordingly, there was no evidence in the record to suggest that G~ and I~ did
                  not innocently enter upon the second marriage.
               
               Moreover, even though G~ and I~ were not living together at the time of G~'s death,
                  they were still married. There was no evidence that they divorced. Even G~'s death
                  certificate listed I~ as his surviving spouse.
               
               This case was somewhat unusual in that B~ and G~ apparently reconciled with each other
                  and lived together until his death in May 1995. B~ even applied for social security
                  benefits as G~'s widow. None of these factors, however, lessen the more supportable
                  presumption that the second marriage between I~ and G~ was valid.
               
               Finally, our opinion is based on the evidence as it currently exists in the file.
                  If new evidence is discovered changing any of the above facts, our opinion may change.
                  In that event, you may want to consult us again.
               
               IV. Conclusion
               It appears that I~ is G~'s widow for social security purposes. Accordingly, she would
                  be entitled to the DIB underpayment, and eligible for widow benefits and the lump
                  sum death payment, provided all the other requirements for these benefits are met.