immediate family member
(1) The term “immediate family member” means, with respect to a person— (A) the husband or wife of the person; (B) the natural or adoptive parent, child, or sibling of the person; (C) the stepparent, stepchild, stepbrother, or stepsister of the person; (D) the father-, mother-, daughter-, son-, brother-, or sister-in-law of the person; (E) the grandparent or grandchild of the person; and (F) the spouse of a grandparent or grandchild of the person.
42 USC § 1320a-7(j)(1)
None identified. Default scope is assumed to be the entire title.