Our house was titled to my parents. My parents has 3 kids of legal age and all are married. my sister(married) died a few years ago with no kids. my brother is also married not in good terms with his wife and has a daughter. my father died also years ago before my sister died. Now we are in the process of selling the house and need some extrajudicial settlement with sale. Does my sister-in-law has to sign also under this exjs?Does she has some legal way to void this sale?