## Facts

- David Thompson (father) and Susan Thompson (mother, later Susan Clay) disputed custody of their minor son, Matthew, following California dissolution proceedings.
- A California court issued a custody decree awarding joint custody.
- When Susan relocated with the child to Louisiana, the California court entered an interim order granting Susan sole custody pending an investigator’s report.
- In Louisiana, Susan sought enforcement of the California decree and a final award of sole custody; the Louisiana court enforced the California order and awarded her sole custody.
- Two months later, after reviewing the investigator’s report, the California court entered a new order granting David sole custody.
- David did not seek enforcement of the later California decree in Louisiana; instead, he sued in federal district court seeking declaratory and injunctive relief establishing the California decree’s validity and the Louisiana decree’s invalidity.
- The district court dismissed the complaint, and the Ninth Circuit affirmed for failure to state a claim under the Parental Kidnaping Prevention Act (PKPA), 28 U.S.C. § 1738A.

## Issues

1. Whether the PKPA creates an implied private cause of action in federal court to determine which of two conflicting state child-custody decrees is valid.
2. Whether, absent a federal cause of action, the PKPA is enforceable through state-court proceedings applying the Act’s full-faith-and-credit requirements.

## Decision

- The Supreme Court affirmed the Ninth Circuit.
- The Court held that the PKPA does not create an implied federal cause of action for private litigants to resolve conflicts between state custody decrees in federal district court.
- The Court concluded that PKPA enforcement occurs through state courts’ obligation to give full faith and credit to qualifying sister-state custody determinations, with Supreme Court review available of final state-court judgments.

## Legal Principles

- A federal statute extending full-faith-and-credit obligations to child-custody determinations does not, without clear congressional intent, imply a private right of action in federal court.
- The PKPA is directed to states and state courts and functions as an addendum to the federal full faith and credit statute, prescribing duties of recognition rather than creating a new federal forum.
- Legislative rejection of proposals to expand federal jurisdiction over custody-decree enforcement weighs strongly against implying a federal remedy.
- Federal courts generally avoid assuming primary responsibility for domestic relations matters absent explicit statutory authorization; state courts remain the principal fora for custody litigation even when federal standards govern recognition of decrees.

## Conclusion

The Court held that the PKPA requires state courts to honor qualifying sister-state custody determinations but does not authorize private parties to file federal district court actions to decide which of competing state custody decrees controls.


Thompson v. Thompson, 484 U.S. 174 (1988)