Cal. PROB § 6606

(a) A petition may be filed under this chapter by any of the following: (1) The person named in the will of the decedent as executor. (2) The surviving spouse of the decedent. (3) The guardian of a minor child of the decedent. (4) A child of the decedent who was a minor at the time the decedent died. (5) The personal representative if a personal representative has been appointed for the decedent’s estate. (b) The guardian of a minor child of the decedent may file the petition without authorization or approval of the court in which the guardianship proceeding is pending.