Cal. PROB § 3411

(a) A parent of a minor entitled to custody of the minor, the guardian of the estate of the minor, or the person holding the money belonging to the minor may file a petition requesting that the court make an order under this article. (b) The petition shall be filed in the superior court of: (1) The county where the minor resides if the minor has no guardian of the estate. (2) The county having jurisdiction of the guardianship estate if the minor has a guardian of the estate.