House property dispute

Good Morning sir, My Parent expired in 2021 without any making will for our House. My elder sister who was married in 1995 , now claiming she has also share in our house. She was staying with my father mother since long time from 2008/2009. After my parent died in 2021 , i asked her to leave our house as i am also got married and i have my son my family to stay. But he is not willing to leave our house and claiming she has also same right to stay in our house. Please suggest how to handle this situation. I want her to leave our house and stay with her husband in her parent-in-law house. In this situation please suggest what i need to do? This land where the house has been built is in my grandfathers's name , not in my father name as it has not yet divided properly between my father & his another 2 brothers. By mutual understanding between my father & other two uncles of mine the house has been build by combining thier shares. Nothing yet registred/recorded in paper. So how this situtaion can handled, plz suggest some ways?