Cal. Probate Code § 3023

(a) Except as provided in subdivisions (b) and (c), where one or both of the spouses has a conservator, the court in which any of the conservatorship proceedings is pending may hear and determine whether property is community property or the separate property of either spouse when the issue is raised in any proceeding under this division. (b) Any person having or claiming title to or an interest in the property, at or prior to the hearing on the issue, may object to the hearing if the court is not the proper court under any other provision of law for the trial of an action to determine the issue. If the objection is established, the court shall not hear and determine the issue. (c) Except as provided in subdivision (d), if a civil action is pending with respect to the issue and jurisdiction has been obtained in the court in which the civil action is pending, upon request of any party to the civil action, the court shall abate the hearing until the conclusion of the civil action. (d) The court need not abate the hearing if the court determines that the civil action was filed for the purpose of delay.