Grandfather ki property m 50% ke liye case file kar sakta hu?

Sir m abhi jis ghar m rahte hu wo mere grandfather ke naam se h and m apni family m akela hu father mother brother sisters koi nhi h and m Kareem 15 saal se apne chacha chachi ke sath rahte hu, mere grandfather ne property kisi ke bhi naam se nhi ki par mere chacha JI ki death ke baat unke bachho ne ye ghar chachi JI ke naam karwa diya h or paper mangne par dikhate bhi nhi h. 100 gaj ka ghar h 3 floor bane h shuru se ghar ke 2 floor rent per diye hue the or sara rent chachi JI apne haat n rakhti h ap meri shadi k baad wo mujhe sirf 1 floor rahne ke liye de rahi h usme bhi khud wo khud sath rahti h,floor apne naam karne ko kahta hu to koi jawab nhi dete. Kya h 50% ke liye case kar sakta hu, kya mere hak m h case.plz guide kijiye m Bohot pareshan hu hame Bohot pareshan karte h ye Sara kharcha mere sir par h .