son or daughter
(6) the term “son or daughter” means a biological, adopted, or foster child, a stepchild, a legal ward, or a child of a person standing in loco parentis, who is— (A) under 18 years of age; or (B) 18 years of age or older and incapable of self-care because of a mental or physical disability;
5 USC § 6381(6)
None identified. Default scope is assumed to be the entire title.