You need to obtain court orders for custody and visitation if you don't have them. If you have court orders in California then you can take action to enforce them by both attempting to modify the court order and registering the court orders in the child's new state. If there are no custody orders at all, then you have to file a new case for custody orders in the child's new State since the child has lived there more than 6 months. You should consult with an attorney in both CA and the new State for more specific advice.
Answered on Oct 26th, 2016 at 7:33 PM