Petunia Blankenhooper is Charlie, Teddy, Toby, Gabe, and PJ's grandmother. She is Amy's mother, Hank's wife, and Bob's mother-in-law. She did mentioned that she does not have a computer, does not know how to work a VCR and doesn't have a DVD player. She calls and talks to Teddy and Charlie, while Gabe doesn't want to. Gabe refuses to because of it not being Christmas or his birthday and Amy just leaves saying that she isn't in the room ("Bye Bye Video Diary"). She also strongly dislikes Bob and constantly blame him for all of Charlie's rebellious behavior.
She must have had learned how to use the internet (in the end) because she has a Buddy Page ("Alley Oops").
- Charlie Goes Viral (mentioned only)
- Bye Bye Video Diary (mentioned only)
- Alley Oops (mentioned only)
- Can You Keep a Secret? (mentioned only)
- Good Luck Charlie, It's Christmas! (first appearance)
Characters: Bob Duncan | Amy Duncan | PJ Duncan | Teddy Duncan | Gabe Duncan | Charlie Duncan | Toby Duncan | Ivy Wentz | Emmett Heglin | Spencer Walsh | Estelle Dabney | Jo Keener | Mary Lou Wentz | Harry Wentz | Skyler | Vonnie | Victor | Jake Mutack | Frank Duncan | Linda Duncan | Mel Duncan | Hank Blankenhooper | Petunia Blankenhooper | Raymond | Lauren Dabney | Paul Walsh | Linda Walsh | Nicole | Kai
Locations: Denver, Colorado | Kwikki Chikki | Super Adventure Land
Songs: Hang in There Baby