Grandfather died want to claim his property and pension

Sir, I am Hindu (bhumihar). I had lost my grandfather and father. My grandfather was a government employee, after his death my grandmother started getting pension and half of property(land) is on his name. She has two daughters both are married in well prosperous family. My father has one son and two daughters unmarried without any job.My father was also an advocate. But he was not govt. Employee. After his death my grandmother always threat us not to give that property which is on her name as well as her pension. She always threat to give that property to her daughter. As we have no source of income for living. Plz advice me for this what to do.