|Age||60s-80s, possibly deceased|
Poppy is Greg's great-grandfather and the father of Grampa and Great Aunt Marcie. He is or used to be married to Lulu. Poppy is on Susan's side of the family. He only appears in The Wimpy Kid Do It Yourself Book, in the family tree drawn by Greg.
- The Wimpy Kid Do-It-Yourself Book (First and only appearance)