Gammie Heffley

Gammie Heffley is Greg's paternal great-grandmother, and is the matriarch of the Heffley family. She has appeared briefly in Dog Days Greg's birthday party but she has a more prominant role in The Ugly Truth. 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.