Biffany "Biff" Van Stomm is the mother of Buford Van Stomm.
Biffany was mentioned when Buford told Phineas that she was going to pick him up at 4 P.M. ("Raging Bully"). She went to the Flynn-Fletcher backyard when Candace called her, Baljeet's mother, Irving's mother, and Linda to bust Buford, Baljeet, Irving, and Albert who were all involved in "bust-worthy activity" ("Not Phineas and Ferb").
She has blue eyes, brown hair, and green earrings. Her dress is yellow with green and red areas on it. She appears to be overweight like her son.
- Her husband was not mentioned and has not appeared in the show.
- Buford's goldfish, Biff, is named after her.
- Her appearance (as well as her voice) is very similar to that of her son's.
- She likes cookies. ("Not Phineas and Ferb").
- "Not Phineas and Ferb" (First appearance)
- "Rollercoaster: The Musical!" (Cameo)
- "Phineas' Birthday Clip-O-Rama!" (Speaking cameo)
- "It's No Picnic" (Cameo)