302. Qualified family (a) General Rule For purposes of this chapter, the term qualified family shall mean one or more family members sharing a common residence. All family members sharing a common residence shall be considered as part of one qualified family. (b) Family Size Determination (1) In general To determine the size of a qualified family for purposes of this chapter, family members shall mean— (A) an individual, (B) the individual’s spouse, (C) all lineal ancestors and descendants of said individual (and such individual’s spouse), (D) all legally adopted children of such individual (and such individual’s spouse), and (E) all children under legal guardianship of such individual (or such individual’s spouse). (2) Identification requirements In order for a person to be counted as a member of the family for purposes of determining the size of the qualified family, such person must— (A) have a bona fide Social Security number, and (B) be a lawful resident of the United States. (c) Children Living Away From Home (1) Students living away from home Any person who was a registered student during not fewer than 5 months in a calendar year while living away from the common residence of a qualified family but who receives over 50 percent of such person’s support during a calendar year from members of the qualified family shall be included as part of the family unit whose members provided said support for purposes of this chapter. (2) Children of divorced or separated parents If a child’s parents are divorced or legally separated, a child for purposes of this chapter shall be treated as part of the qualified family of the custodial parent. In cases of joint custody, the custodial parent for purposes of this chapter shall be the parent that has custody of the child for more than one-half of the time during a given calendar year. A parent entitled to be treated as the custodial parent pursuant to this paragraph may release this claim to the other parent if said release is in writing. (d) Annual Registration In order