Living together as partners and having sexual relationship by same sex individuals (which is decriminalised now) is not comparable with the Indian family unit concept of a husband, a wife, and children which necessarily presuppose a biological man as a 'husband', a biological woman as a 'wife' and the children born out of the union between the two - who are reared by the biological man as father and the biological woman as mother, the Centre said in a filing to the Supreme Court on Sunday, urging the court to reject challenges to the current legal framework lodged by LGBTQ+ couples.