Property having two minors daughter along with their mother and two uncles

My friend made a agreement to purchase a property and paid token amount and also made agreement in 100rs stamp paper. Now he approaches me to sale that same property n i agreed but didnt made any agreement niether with him nor with the parties with whom he made purchase agreement. Some infomation about property. Property card shows that it has two Equal parts(by partition deed) One part is own by only one person Second part is owned by four ie mother and their three sons .(father deseased) I have made a 50% payment to all five member acoording to their share in that property and sale deed was soppose to be executed after few weeks. But before the sale deed one member of the second part of the property died in an accident leaving behind wife n two minor daughters. Now the propert card shows following name One part is own by only one person Second part is owned by six ie mother, her two sons and wife n two minor daughter of diseased third son. I asked them two apply for permission to sale second part from court as it has minors share. But they didnt. So i went further and made a sale deed of the first part of property own by one person few months back n had my name on the the property card. Now i m stuck for the second part and i have paid 50% of the payment two earliers four members mentioned. And i cant use first part of property( being small in widht ie 7feet) which has my name in it because it was divided by partition deed. Please suggest