I had an Aunt like that.

  When i was about 8, we used to go camping in large groups.
  "Happy Wanderers". Families, that sort of thing.

  Anyway, one time, my mom had to leave for a few hours and she
  asked my Aunt to watch me. She said, "Sure".

  Mom comes back a few hours later.

  "Where's Kenny?"

  "Oh I dunno", my Aunt lovingly replied, "Not my kid."

  Last time Mom asked her to keep an eye on me. tongue emoticon