My sisters husband died a week ago. Husband and his sister were willed the property where the parents are living. The proeprty was bought by the husbands father. Sister and Husband stayed on the top floor of the property for over 26 years. This was done because the Husband ran the business which was in his fathers name and the father would take 50% of earning. Both Father and Mother are alive. Now the Husband's sister is pressurizing her father to give the entire property to her. What should my sister do?