|Name||Marcie (Unknown Surname)|
|Book Appearance?||Yes (Mentioned only)|
Great Aunt Marcie is the great-aunt of Greg and the sister of Grampa and from Susan's side, she adopted a 3 or 4 year old toddler named Cecil and is Greg's adoptive's uncle and is considered an adult in the family.
- Diary of a Wimpy Kid: Hard Luck (Mentioned only)
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