Code of Federal Regulations Title 8. Aliens and Nationality § 8.245a.31 Eligibility

(a) He or she is the spouse or unmarried child under the age of 21 of an eligible alien (as defined under § 245a.10) at the time the alien's application for Family Unity benefits is adjudicated and thereafter;

(b) He or she entered the United States before December 1, 1988, and resided in the United States on such date;  and

(c) If applying for Family Unity benefits on or after June 5, 2003, he or she is the spouse or unmarried child under the age of 21 of an alien who has filed a Form I–485 pursuant to this Subpart B.