Can my father transfer property through a gift deed

i am 24 years old(male) .i have a elder brother(27) and a small brother(14). my mother is died few year ago.and after death of my mother my father marriage again. me and my elder brother(1 mother)and my small brother(2 mother ) son. my father some property gift to me as the base of gift deed.but problem is my stepmother now want to cancel the gift deed .and petition a title suit against me my my elder brother and my father. so please give me some suggestion or advice.