Cal. Civ. Proc. Code § 374.5

A proceeding initiated by or brought against a minor for any of the injunctions or orders described in paragraph (1) of subdivision (b) of Section 372 or subdivision (a) of Section 374 shall be heard in the court assigned to hear those matters; except that, if the minor bringing the action or against whom the action is brought has previously been adjudged a dependent child or a ward of the juvenile court, the matter shall be heard in the juvenile court having jurisdiction over the minor.