Thanks for the answer. Holy moly. That is not good. I wish they would change it or at least put a huge warning, "SHARING IS PERMANENT, YOU CANNOT UNDO THIS". I was considering deleting and doing a new tree, but you say that even this won't work. But I assume that if I delete all the individuals from the existing tree, this will delete them for all the people who are sharing it, too. Basically take a flamethrower to the whole thing. Right?