I have lived in my grandmother house for 30 years and took over the bills. She moved in with my sister about 5 years ago. Since than I have paid all property taxes and insurance. Just this year I spent over 40,000 getting electrical and plumbing done. I also added a room and shower. My sister came out of nowhere and says she wants to sale the house. Is there anything I can do to protect myself and all the money i have invested.