In any action or proceeding involving custody of a minor child, a party has a continuing duty to inform the court if he or she obtains further information about a custody proceeding in a California court or any other court concerning a child who is named in the petition, complaint, or response. To comply with this duty, a party must file an updated UCCJEA form with the court and have it served on the other party.
Cal. R. Ct. 5.52