Family property dispute , my grandfather had house constructed and gave possession of ground floor to my?

father , we are living there for last 40 yrs, he had 3 sons , after intestate death of my grandfather and my father and 1 uncle , the family cliam division of property in 1/3 rd . My father had put lot of money in construction of house and had renovated from time to time and no one had any objection then.
pls advice , can i retain ground floor of my hosue in possession.