My father made an agreement of sale on 31-12-1997, for Rs.8,50,000. and the purchaser paid Rs.6,50,000 as advance and on 1-1-1998 he paid Rs.50,000 and took a letter stating possession is given to him, afterwards he never came to pay the balance money and did not get it registered the property.My father expired in the year 2003. Now can we sell the property to some one else other than the earlier agreement holder. Whether the agreement is still valid, can the agreement holder can sell the property. The agreement of sale is not registered and it is on Rs.100 stamp paper, we learn that they paid stamp duty now and got impounded the document.