Hindu Adoptions and Maintenance Act, 1956
6. Requisites of a valid adoption
No adoption shall be valid unless-
(i) the person adopting has the capacity, and also the right, to take in adoption;
(ii) the person giving in adoption has the capacity to do so;
(iii) the person adopted is capable of being taken in adoption; and
(iv) the adoption is made in compliance with the other conditions mentioned in this Chapter.