Legal Hiers of Property of Uncle

My Grandfather has four Children ,two Son's and Two Daughters. Fort the Sake of Convenience i will name them as below : My Grandfather and Grandmother Died long back in 1980 Something. ElderBuaji married and is away YoungerBuaji married and got divorced after some years My Uncle and Father built house of 1500 Sq ft.On name of My Uncle. My Uncle dont have any kids and her Wife died long back.My Uncle My Father has two kids (1 son and 1 Daughter) and my Mom. My Father died long back ,My Sister is divorced and living with us. So currently total number of people living in house are 4 (me,my divorced sister,mom and uncle) My Uncle dont have any will and he is not in good health. he is very reluctant to talk about the Peoperty. What will going to happen if died without will? Can i claim the whole house and sell it. Who are the heirs other than me in this Case?