Cal. Welf. & Inst. Code § 5325.4
(a) If a person is involuntarily detained for assessment, evaluation, or treatment under this part, the facility to which the person is brought shall offer and provide a copy of the State Department of Health Care Services’ prepared patients’ rights handbook to a family member of the detained person under any of the following circumstances:
(b)
(d) For purposes of this section, “family member” means any of the following: