Cal. PROB § 4203

(a) A principal may designate one or more successor attorneys-in-fact to act if the authority of a predecessor attorney-in-fact terminates. (b) The principal may grant authority to another person, designated by name, by office, or by function, including the initial and any successor attorneys-in-fact, to designate at any time one or more successor attorneys-in-fact. (c) A successor attorney-in-fact is not liable for the actions of the predecessor attorney-in-fact.