The documents needed to sell the property are the title document, current encumbrance certificate, legal heirship certificate, property tax receipts, ID proofs of the shareholders, water tax receipts, electricity connection consumer number with card, any other relevant documents pertaining to the property.
The copy of the will and the copy of the property tax card shall be sufficient to prove your ownership of the share of the deceased uncle.
You must insist the buyer to pay the full case and then get the property registered on his name, without the receipt of full sale consideration amount, do not execute the registered sale deed in his favor.