Cal. Welf. & Inst. Code § 316.2
(a) At the detention hearing, or as soon thereafter as practicable, the court shall inquire of the mother and any other appropriate person as to the identity and address of all presumed or alleged fathers. The presence at the hearing of a man claiming to be the father shall not relieve the court of its duty of inquiry. The inquiry shall include at least all of the following, as the court deems appropriate: