Under the laws of most states in this country, if you and your sisters are all on legal title to the house you three inherited, and there is no written agreement to the contrary that rent is to be paid, each owner of the house has the right to live in it rent free.The chances of being successful in winning a lawsuit against your sister for unpaid rent on a home she owns has little chance of success.However, if you paid her share of the property taxes for the home she owns with you, you are entitled to repayment io the amount with accrued interest from her. You should be successful against her for that claim.