My father is is 75+ years old and not in very good mantel health. Most of the time he remains with us in our parental home in our native village. But since last 5-6 months he is staying with our eldest brother who lives in different city. He is very mighty in money and power and is very egoist too for his capabilities. Since he has very different opinion with other family members, our relations are not good. But till now there was no property issue. Now some news are coming from different relatives that he has persuaded our father (or forced) to sign on some paper/stamp paper. On behalf of these signs he is claiming that he will take all our parental property (Mostly it is agriculture land in our native village) to his name or his children's name. Things are very hazy since we don't have any document against him. My question is how can we stop him in doing so or can we give some application in advance to revenue department against such fraud. Particularly, we know when we will talk to our father, he will be ready to give any statement anywhere in favors of us reverting to his earlier statement.