Mr. Grove is the father of Alyssa Grove. He complained to Frank after Greg and Rowley sent 20 "prank" messages (Greg thought hitting the "pound" key deleted them) to his answering machine, asking his daughter, Alyssa Grove, to the school dance. He then said he would appreciate it if they never called his house again.
- He isn't married to Ms. Grove, because Ms. Grove has "Ms." in her name, signifying that she is single.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)