California Code, Probate Code - PROB § 1820

(a) A petition for the appointment of a conservator may be filed by any of the following:

(b) If the proposed conservatee is a minor, the petition may be filed during his or her minority so that the appointment of a conservator may be made effective immediately upon the minor's attaining the age of majority. An existing guardian of the minor may be appointed as conservator under this part upon the minor's attaining the age of majority, whether or not the guardian's accounts have been settled.

(c) A creditor of the proposed conservatee may not file a petition for appointment of a conservator unless the creditor is a person described in paragraph (2), (3), or (4) of subdivision (a).