Adult Adoption and Same-Sex Couples: Legal Issues After Death

Before Obergefell v. Hodges legalized same-sex marriage in 2015, some committed same-sex couples pursued a radical legal workaround: one partner adopted the other as a legal adult. It was one mechanism available in some jurisdictions to create a formal legal relationship that could affect inheritance and other disputes.

It worked. In jurisdictions where same-sex marriage, domestic partnerships, and civil unions didn't exist, adult adoption could give the adopted partner inheritance rights, but its effect on medical decision-making and other authority depended on state law.

But when one partner in an adult adoption dies, the legal landscape becomes extraordinarily complicated — because the law now treats the survivor as both a romantic partner and a legal child of the deceased.

The Core Problem: You're Their Legal Child

Under adult adoption, the surviving partner's legal relationship to the deceased is that of an adopted child, not a spouse. This distinction matters for every system that distinguishes between spouses and children:

Social Security survivor benefits. Adult children can receive survivor benefits only if they were dependent on the deceased and are either under 18, a full-time elementary or secondary school student under 19, or disabled before age 22. An adult adoptee who doesn't meet these narrow criteria is ineligible for survivor benefits as a "child" — and cannot claim spousal survivor benefits because no marriage exists. If the couple later married after Obergefell, the situation is even more tangled: some states treat the adoption as an impediment to marriage (you can't legally marry your parent), creating potential questions about the validity of the marriage itself.

Estate and probate. Here, adult adoption typically works in the survivor's favor. Adopted children are treated identically to biological children for inheritance purposes. If the deceased died without a will, the adopted partner inherits under intestacy as a child — often before biological siblings, depending on the state's hierarchy. If there are biological children, the adopted partner's share is calculated alongside them, not in place of them.

Tax treatment. The federal unlimited marital deduction doesn't apply to parent-child transfers. If the estate is large enough to trigger federal estate tax (the basic exclusion amount is $15 million for decedents dying in 2026), the adopted partner does not receive the unlimited marital deduction available to a spouse. For state inheritance tax purposes (relevant in NJ, PA, MD, and a few others), adopted children are typically taxed at the same favorable rates as biological children — significantly better than the "stranger" rates applied to unmarried partners.

Can You Undo the Adoption and Keep the Marriage?

Some couples who adopted pre-Obergefell and then married post-Obergefell have attempted to annul the adoption to clean up their legal status. Courts have been inconsistent. In some jurisdictions, annulling the adoption is straightforward — the parties were adults who entered a legal arrangement for a specific purpose, and that purpose is now served by marriage. In others, courts have refused to annul, treating the adoption as permanent regardless of the parties' intent.

If your partner has already died, the legal status at the time of death generally controls inheritance, benefits, and next-of-kin authority; whether any post-death challenge to the adoption is available is jurisdiction-specific.

What to Do If This Is Your Situation

The intersection of adult adoption and same-sex partnership death is niche enough that most estate attorneys and SSA field offices have never encountered it. You need an attorney who specifically understands LGBTQ+ family law — not just estate law, not just adoption law, but the interaction between the two.

Lambda Legal's help desk (lambdalegal.org/helpdesk) is the best starting point. They've dealt with these cases directly and can evaluate whether your specific situation creates options or obstacles for survivor benefits, estate distribution, and tax treatment.

The When Your Same-Sex Partner Dies toolkit includes a legal status audit worksheet that helps you document your exact legal relationship to your partner — marriage, domestic partnership, adult adoption, or none — and maps each status to its specific consequences for benefits, inheritance, and medical authority.