California Code, Code of Civil Procedure - CCP § 416.60

A summons may be served on a minor by delivering a copy of the summons and of the complaint to his parent, guardian, conservator, or similar fiduciary, or, if no such person can be found with reasonable diligence, to any person having the care or control of such minor or with whom he resides or by whom he is employed, and to the minor if he is at least 12 years of age.