Child custody becomes more complicated when parents and children live in different states. A parent may file a case in California while the other parent believes custody should be decided somewhere else.

California courts apply interstate jurisdiction rules before deciding the merits of many custody disputes. One of the most important concepts is the child’s home state. Determining which state has jurisdiction can be the first major issue in a California interstate child custody case.

What Does “Home State” Mean in a California Child Custody Case?

For a child who is at least six months old, the home state generally focuses on where the child lived with a parent or a person acting as a parent for at least six consecutive months immediately before the custody proceeding began.

Temporary absences are generally included as part of that period.

Different rules apply to a child younger than six months. In that situation, the analysis generally looks to the state where the child lived from birth with a parent or person acting as a parent.

These rules help prevent competing states from making inconsistent custody decisions.

Can California Have Custody Jurisdiction After a Child Moves Away?

Potentially.

California may qualify as the child’s home state even when the child is no longer physically living here on the day the custody case is filed.

Home-state jurisdiction can apply when California was the child’s home state within six months before the proceeding began, the child is now absent from California, and a parent or person acting as a parent continues to live in California.

The timing of a move and the filing of the custody proceeding can therefore become extremely important.

Parents should not assume that moving across a state line immediately transfers custody jurisdiction to the new state.

What if No State Qualifies as the Child’s Home State?

Home-state jurisdiction is not the only possible basis for making an initial custody determination.

California may have jurisdiction in certain circumstances when no other state qualifies or when a court with home-state jurisdiction declines to exercise it.

The analysis can involve whether the child and at least one parent have a significant connection with California beyond mere physical presence and whether substantial evidence concerning the child’s care, protection, training, and personal relationships is available here.

Jurisdiction can also arise when courts in other states that could exercise jurisdiction determine that California is the more appropriate forum.

Interstate Custody Jurisdiction Should Be Addressed Before the Parenting Dispute

A parent may have strong arguments about the child’s school, parenting schedule, stability, or best interests, but the California court must first have authority to make the custody determination.

Interstate cases can therefore involve two separate questions: which state should hear the case and what custody arrangement should be ordered.

Parents who have recently moved—or whose child has been taken to another state—should pay close attention to dates, residences, prior custody orders, and any cases already filed elsewhere. Those details can determine whether California has jurisdiction before the court ever reaches the underlying child custody and visitation dispute.