My mother passed away 7yrs ago. I have two questions.

My mother passed away due to complications of hip surgery. She resided in a nursing home. The nurses were supposed to supervise her doing walking and taking a shower. When she broke her hip in the home, she was walking down the hallway by herself. Is it too late to sue the nursing home. Question 2. My mother willed me her house. My step sister ended up selling the house without my my permission. Is that illegal? - Is this your question? Add additional information