Explanation:

Section 11. Other conditions for a valid adoption. In every adoption, the following conditions must be complied with:- (i) if any adoption is of a son, the adoptive father or mother by whom the adoption is made must not have a Hindu son, son’s son or son’s son’s son (whether by legitimate blood relationship or by adoption) living at the time of adoption; (ii) if the adoption is of a daughter the adoptive father or mother by whom the adoption is made must not have a Hindu daughter or son's daughter (whether by legitimate blood relationship or by adoption) living at the time of adoption; (iii) if the adoption is by a male and the person to be adopted is a female, the adoptive father is at least twenty-one years older than the person to be adopted;
(iv) if the adoption is by a female and the person to be adopted is a male, the adoptive mother is at least twenty-one years older than the person to be adopted