Harry's aunt. Though she's spent most of her life insisting that her son Dudley is big-boned and a gentle giant, this summer forces her to confront the truth: Dudley's school nurse insists that he needs to go on a diet to lose weight. To try to make Dudley feel better, Petunia insists that everyone in the house observe the diet as well. She's distraught when Dudley eats one of Fred's Ton-Tongue Toffees.
Aunt Petunia Character Timeline in Harry Potter and the Goblet of Fire
The timeline below shows where the character Aunt Petunia appears in Harry Potter and the Goblet of Fire. The colored dots and icons indicate which themes are associated with that appearance.
...so the school nurse recommended a diet consisting mostly of what Vernon calls "rabbit food." Petunia insists that the entire family follow the regime to make Dudley feel better about it.... (full context)