Hello, my parents recently have passed away and have left their home to me and my sibling equal share. I have always lived in the home and my sibling has moved out and is married. My sibling has agreed to leave the house to me in a will if my sibling were to pass away. My sibling's spouse now believes they also own half the house through being married to my sibling. My sibling does not want the spouse to have any say in it. I pay all bills and expenses and maintenance for the house and my sibling's spouse has no involvement with upkeep and paying of bills, expenses etc for the house. My question is if my sibling has made it absolutely clear in the will that I will get full ownership of the house, can my sibling's spouse challenge it in court and win? If so are there other legal ways to stop a challenge? Thanks