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Lawrence Heffley is Frank Heffley's cousin. He is Greg, Rodrick and Manny Heffley's uncle. He probably is the son of a brother or sister of Grandpa. He is the grandson of Chester Heffley and Gammie Heffley. Greg says he is always traveling and never comes to family gatherings. Sometimes Lawrence makes appearances by webcam, such as a time at Chester Heffley's funeral.
- Diary of a Wimpy Kid (online) (First appearance)
- Diary of a Wimpy Kid: The Ugly Truth (First and only book appearance)