Legal Question in Family Law in India

The ancestral property will fall to sons of S2 only if the property he sold before his death to S1 does not include his inherited property. In case he has sold the inherited property (which he had no right to alienate) then it becomes the self acquired property S1. Hence in such case all the property including the one settled by your grandmother will fall to the share of S1's wife to the exclusion of S1's sons wife presuming her husband did not acquire any interest in his father's property before his death and the ancestral property. Now S2's sons will have to claim their share from S1's wife for the ancestral property. There may be litigation in that case. However the fact remains that S-2 if presumably did not sell the ancestral share to S-1 then S-2 's sons will also inherit the ancestral property along with S1's wife.

NB: PLEASE SEE MY PREVIOUS REPLY TO THE SAME QUERY answered today.

PS: THE SISTERS of S1 and S2 cannot claim a share as the property had already been settled and if your grandmother was not eligible to settle the property then the sisters of S1 and S2 could claim share from all the beneficiaries but they will have to contest a long legal battle.