Dear Annie: My only sister, “Donna,” and her husband, “Otis,” moved out of state, leaving me as the sole caregiver to our 97-year-old father. Their adult daughter “Leah” did not move with them and stayed here locally not far from my father. My father lives near me and rents a small home in a senior community, which he enjoys, but has kept his old, empty, rundown home nearby. Although his empty…