Lawrence is Frank Heffley's cousin. He is Greg, Rodrick and Manny Heffley's first cousin once removed. 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)