Who among the following is eligible to adopt a son under Hindu Law ?

Section 11(i) of the Hindu Adoptions and Maintenance Act, 1956 allows a person to adopt a son only if he or she does 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". A living natural or adopted son bars the adoption of a son, even if he has separated on partition.