Gammie Heffley

Gammie Heffley is Greg's paternal 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. She is the great-grandmother of Greg, Rodrick, and Manny. She is the grandmother of Greg's dad, Uncle Joe, and Uncle Gary. She is the mother of Grandpa Heffley. She was married to Greg's great-grandpa Chester until his death.

Trivia

 * Gammie is one of the few characters in the series to have a confirmed age