Uncle Cecil is Greg Heffley's adoptive uncle and Susan's adoptive cousin who appears in Hard Luck. He is considered as such through Great Aunt Marcie, his adoptive mother. Although he is only 3 or 4 years old, he is considered an adult, possibly for simply being a generation before Greg, and is allowed to sit in the dining room with the adults during a family gathering on Easter.[1]
Technically, he is actually Greg's first cousin once removed. It is likely, though, that the Heffleys do not know that term.
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