I work closely and am friends with the daughter of a (now deceased) T I had in my late teens and briefly again in my twenties. When I made that connection a few years ago I felt a bit nauseated. I've never told my friend that her mom used to be my T. It seems too weird to me and I know that it's not information I can take back if I don't like my friend's reaction. She doesn't talk about her mom a lot but I definitely listen when she does!