; (15) the term grandchild means the son or daughter of an employee’s son or daughter; (16) the term grandparent means a parent of a parent of an employee; (17) the terms nephew and niece , used with respect to an employee, mean a son or daughter of the employee's sibling; (18) the term parent-in-law means a parent of the spouse or domestic partner of an employee; (19) the term sibling means any person who is a son or daughter of an employee’s parent (other than the employee); (20) the terms son-in-law and daughter-in-law , used with respect to an employee, mean any person who is a spouse or domestic partner of a son or daughter, as the case may be, of the employee; (21) the term State has the same meaning given the term in section 3 of the Fair Labor Standards Act of 1938 ( 29 U.S.C. 203 ); and (22) the terms uncle and aunt , used with respect to an employee, mean the son or daughter, as the case may be, of the employee's grandparent (other than the employee's parent). . (2) Inclusion of adult children and children of a domestic partner Section 6381(6) of such title is amended— (A) by inserting a child of an individual’s domestic partner, after a legal ward, ; and (B) by striking who is— and all that follows and inserting and includes an adult child . (b) Leave Requirement Section 6382 of title 5, United States Code, is amended— (1) in subsection (a)— (A) in paragraph (1)— (i) in subparagraph (C), by striking spouse, or a son, daughter, or parent, of the employee, if such spouse, son, daughter, or parent and inserting spouse or domestic partner, or a son or daughter, son-in-law or daughter-in-law, parent, parent-in-law, grandparent, grandchild, sibling, uncle or aunt, or nephew or niece of the employee, or any other individual whose close association with the employee is the equivalent of a family relationship, if such spouse, domestic partner, son or daughter, son-in-law or daughter-in-law, parent, parent-in-law, grandparent, grandchild, sibling, uncle or aunt, or nephew or niece, or such other individual