Under the Hindu Adoptions and Maintenance Act, 1956, an adopted child is prohibited from marrying:

Proviso (a) to section 12 says "the child cannot marry any person whom he or she could not have married if he or she had continued in the family of his or her birth". The birth-family bars apply in addition to those in the adoptive family, but they reach only the prohibited degrees and sapinda relations, not every member of the birth family or a gotra.