CALIFORNIA FAMILY LAW
...Procedure Before Trial/Hearing
......Jurisdiction-Subject Matter/Residency
.........Concurrent Jurisdiction
5 Cards On This Topic:

Finding of jurisdiction by courts of one state in contested divorce action bars collateral attack on judgment on jurisdictional grounds in courts of another state.

If two states have subject matter jurisdiction, paramount jurisdiction determined by first party to serve, not first to file.

Later judgment between two parties in same action supersedes earlier judgment from different court.

If actions pending in two states, state where second action brought may, in its discretion, stay its proceedings.

First to serve, not first to file, has priority.