Sister and her husband not vacating house

My father constructed a house on self acquired land in 1994 which was later extended to a double storey building by me. Ownership was transferred for both the land and building in favour of me by way of gift deed.My father passed away few months ago.Now my sister came to our house along with her son and husband to reside permanently.They often make trouble with me and brother in law dont do any work.They are totally dependent on me and becoming my headache day by day.When i told them to vacate the house they argue that they have equal share in the house.Please guide me what can be done.Can sister claim her share?