I had made an agreement for sale of a property with one of our partners, and it was notarised by a notary. Now the partner is dead. And now his children are coming and saying that all the doucments are forged.. I used to pay the partner in installments. I have all the receipts with his signatures. And his childrens are saying that even the receipts are forged.. how is it possible.. plz.. guide me on this..