Section 5100.8 Of Article 2. General Definitions From California Financial Code >> Division 2. >> Chapter 1. >> Article 2.

. "Immediate family" of any natural person means any of the following (whether by the full or half blood or by adoption):
  (a) The person's spouse, father, mother, children, brothers, sisters, and grandchildren.
  (b) The father, mother, brothers, and sisters of the person's spouse.
  (c) The spouse of a child, brother, or sister of the person.