Billy's mother is a resident of Gravity Falls, Oregon.
Billy's mother appears among the tourists at the Mystery Shack in "Boss Mabel." She angrily takes a refund after Billy is injured by Wendy's friends when they accidentally hit him in the face with a shrunken head, giving him a black eye and causing him to cry. She then storms out angrily with her son.
Little is known about her personality, though she seems easily angered and cares about her son's appearance.
She has light brown hair with an orange headband. She wears an orange tank top, olive-brown shorts, brown socks, and brown flats. She wears small green earrings.
- 113. "Boss Mabel"
- 9. "Mabel's Guide to Fashion" (no lines)
"Billy! Your face, it's ruined!"
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