parent
(5) The term “parent” means (except for purposes of chapter 19 of this title ) a father, a mother, a father through adoption, a mother through adoption, or an individual who for a period of not less than one year stood in the relationship of a parent to a veteran at any time before the veteran’s entry into active military, naval, air, or space service or if two persons stood in the relationship of a father or a mother for one year or more, the person who last stood in the relationship of father or mother before the veteran’s last entry into active military, naval, air, or space service.