Uncle doing illegal construction on grandmother's property want stay

I live in a house which had been sold by the owner in two sell deed.. Firstly on my grandmother's name .Half of the south portion which consist two rooms and a latterin and bathroom.and a choch facing toward west main gate direction In 26 DEC 1974.Later on he sold the northen half part to my mother on 27july 1975 .which consist two rooms two kitchen and a chock toward north east direction and a varanda .From the beginning my chacha lives in all on my grandmothers property with one of my kitchen. No mention of stair which is in south part. Can I take stay if my chacha constuct.