Gammie Heffley

Gammie Heffley is Greg's great-grandmother and is the matriarch of the Heffley family. She has only appeared in The Ugly Truth, but had a major role in the story. Also, one time she thought she had won a lottery scratch ticket, but it turned out you needed to match 3 fruits to win. She gives everybody a lecture called "the Talk". All of the furniture in her house is old and valuable, and people have already started claiming some of it for when Gammie dies. Gammie also gives advice to Greg about growing up.

Trivia

 * Gammie is one of the few characters in the series to have a confirmed age
 * Accoring to the family tree in "The Wimpy Kid:Do it yourself book" Gammie is on Susan's side of the Heffley family.