A Hindu girl wishes to marry her mother's sister's adopted Hindu son who happens to be her childhood…

Under section 12 of the Hindu Adoptions and Maintenance Act, 1956, an adopted child is deemed the child of the adoptive parents for all purposes, so the boy is in law her mother's sister's son. Children of two sisters are within the degrees of prohibited relationship under section 3(g)(iv) of the Hindu Marriage Act, 1955 and are also sapindas, so the marriage is void under sections 5(iv), 5(v) and 11 unless a custom permits it. Their childhood friendship before the adoption makes no difference.