I moved my increasingly demented dad in with me when he was 92. He and my mom divorced the summer I graduated high school. She came out for the holidays every year and I worried how they would get along, but he never seemed to put together that my mom had to be his ex-wife. He was puzzled when he was telling a winter story about the cabin we lived in for my first 4 years and she chipped in with a memory. How could SHE know something like that;)