To clarify the situation, Seller got this property as inheritance . I Thank every one above for the valuable feedback. I aslo have few things in mind, but not sure if I'am correct.
1) If it is possible for me to register a case on the daughters as a breach of agreement as a seperate civil case.
2) File a case on the seller as he is still alive luckily to rectify the litigation on the property as in the sale it is mentioned that what ever the problems may arise, he will sort it out in the future.
3) Infact , we have bought all his lands, to all the property which we bought , all daughters have signed, except for one major one. So, can the agreement that the daughters signed states, that we as in their families in the future would have no stake, as they already have agreed for a particular sum of money.
Thank you for all your feedbacks in advance .