California Code, Probate Code - PROB § 3130

(a) Except as provided in subdivision (b), upon the filing of the petition, the clerk shall issue a citation to each nonpetitioning spouse alleged to lack legal capacity for the proposed transaction, setting forth the time and place of hearing.  The citation and a copy of the petition shall be served upon the spouse at least 15 days before the hearing.

(b) Unless the court otherwise orders, if a spouse alleged to lack legal capacity for the proposed transaction has a conservator, no citation to the spouse need be issued, and the petitioner shall cause a notice of the time and place of the hearing on the petition, accompanied by a copy of the petition, to be served on the conservator at least 15 days before the hearing.

(c) Service under this section shall be made in the manner provided in Section 415.10 or 415.30 of the Code of Civil Procedure or in such other manner as may be authorized by the court.  If the person to be served is outside this state, service may also be made in the manner provided in Section 415.40 of the Code of Civil Procedure.