California Code, Code of Civil Procedure - CCP § 1250.220

(a) The plaintiff shall name as defendants, by their real names, those persons who appear of record or are known by the plaintiff to have or claim an interest in the property described in the complaint.

(b) If a person described in subdivision (a) is dead and the plaintiff knows of a duly qualified and acting personal representative of the estate of such person, the plaintiff shall name such personal representative as a defendant.  If a person described in subdivision (a) is dead or is believed by the plaintiff to be dead and if plaintiff knows of no duly qualified and acting personal representative of the estate of such person and states these facts in an affidavit filed with the complaint, plaintiff may name as defendants “the heirs and devisees of __________ (naming such deceased person), deceased, and all persons claiming by, through, or under said decedent,” naming them in that manner and, where it is stated in the affidavit that such person is believed by the plaintiff to be dead, such person also may be named as a defendant.

(c) In addition to those persons described in subdivision (a), the plaintiff may name as defendants “all persons unknown claiming an interest in the property,” naming them in that manner.

(d) A judgment rendered in a proceeding under this title is binding and conclusive upon all persons named as defendants as provided in this section and properly served.