California Code, Civil Code - CIV § 799.9

(a) A homeowner may share his or her mobilehome with any person 18 years of age or older if that person is providing live-in health care, live-in supportive care, or supervision to the homeowner.  Management shall not charge a fee for the live-in caregiver, but may require written confirmation from a licensed health care professional of the need for the care or supervision, if the need is not readily apparent or already known to management.  That person shall have no rights of tenancy in, and shall comply with the rules and regulations of, the subdivision, cooperative, or condominium for mobilehomes, or resident-owned mobilehome park.

(b) A senior homeowner who resides in a subdivision, cooperative, or condominium for mobilehomes, or a resident-owned mobilehome park, that has implemented rules or regulations limiting residency based on age requirements for housing for older persons, pursuant to Section 799.5, may share his or her mobilehome with any person 18 years of age or older if this person is a parent, sibling, child, or grandchild of the senior homeowner and requires live-in health care, live-in supportive care, or supervision.  Management shall not charge a fee for this parent, sibling, child, or grandchild, but may require written confirmation from a licensed health care professional of the need for the care or supervision, if the need is not readily apparent or already known to management.  Unless otherwise agreed upon, the management shall not be required to manage, supervise, or provide for this person's care during his or her stay in the subdivision, cooperative, or condominium for mobilehomes, or resident-owned mobilehome park.  That person shall have no rights of tenancy in, and shall comply with the rules and regulations of, the subdivision, cooperative, or condominium for mobilehomes, or resident-owned mobilehome park.  As used in this subdivision, “senior homeowner” means a homeowner or resident who is 55 years of age or older.