I received an Ancestry "hint", although I'm only a guest member, and amongst other entries found my own name on a tree. I then edited the entry to read "living person", so it now stops at my parents, who are both dead. The other entries are correct and can be found in public records anyway. I guess the person who invited me to be a guest member and who is distantly related to me has added my family to his, which is fair enough. I did allow him to see my tree on GR, after all.
Gillg