Is it possible to cancel Gift settlement

Respected Sir, My mother has expired in 2010. I m having two younger brothers. My father has given a gift settlement of house which earned from his own source, to me on November 2012 without any conditions with the acceptance of my brother's, both have signed in a settlement deed as a witness. I have changed my name in patta. But still not changed Property Tax and other taxes. Is there any chances of my father can cancel the settlement? Can my father revoke the same ??? If my father writes a will. Is it becomes valid??. Can my brother's challenge me by making a case on me and they ask for a partition ?? Pls suggest sir. Waiting for your valuable reply sir.