Property divison between 2 sons and 1 daughter

My Father has given all his property to my mother.My father also have some ancestor land in his native.He sold some part of ancestor land for building the house.Now my mother is the owner of all the property and asking me to leave the house.I am the younger son as my father is bedridden i m staying with him and taking care, but my mother and sister and elder brother are forcing me to stay separately and want me to leave house.I didn't study much but can earn to feed my wife and son(2 years old).I would like to know whether i will get some part in the property or no? As my mother will definately transfer the property to the sister and brother.So what should i do for my safer side?Before they have taken my signature on blank affidivate for this reason i think.So pls guide me to solve this problem