How to add my name as owner in a flat if I paid some amount for it

Under mutual understanding including parents me and brother purchase 2bhk flat. I have spent 6lacs from my pocket. Home loan was applied by him but home loan amount was settled by my father. Flat was expected our both name.but flat put to registration in his wife and his name. I was but reason placed was as he applied for home loan he cannot my name in registration.Can I claim my share in house and how. I asked him add my name but claim to sale flat have 3 equal share. Price place so high there no customer to purchase it been 2 yrs now. So place help