Mrs. Delarosa is the mother of Dean Delarosa, she only appeared in a flashback of Cabin Fever. In a flashback when Dean Delarosa was in the 3rd grade and was having a birthday part, he invited Greg too. But Greg's mother got the date wrong and Greg went their a week ago. Then Mrs. Delarosa told Greg that there was still a week until the party.
- Diary of a Wimpy Kid: Cabin Fever (First and only appearance)