My father died in this year. My father built a single storied house in Rajarhat. The house is already in the name of my father. But only my father & mother verbal communication I had already built up the 2nd floor. The entire expenses born by me. But now my sister could not ready to sign for division the property. She is claiming 50% of the entire property. She could not understand that the entire 2nd floor born by me. Then what is the way to avoiding this. I don't want to share the building to her, but others I can ready to share her. So please guide me what is the way that she do not claim for the entire house ?