1) if property has been self acquired by grand father it is not ancestral property
2) ongrand father demise your father would be absolure owner of property and can bequeath it as he pleases
3) your father can by will bequeath it to his 2 sons
4) property which has remained undivided for 4 genrations would be ancestral property
5)if it is ancestral property you have to file suit for partition to claim your share in property
6) obtain copy of regd sale deed from sub regsitrar office