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Reba Heffley is the great-aunt of Greg, Rodrick and Manny. One Christmas, Gammie invited the whole family over, but she forgot Reba. Reba came anyway, but she refused to take off her coat, probably to make everybody else feel guilty.
In Diary of a Wimpy Kid: Wrecking Ball, Susan is upset because Reba had passed away. She gave the Heffleys money when she passed away, she plays a key part in wrecking ball. She also used to write Greg angry letters when he didn't send her thank you notes for the birthday money she gave him.