Frank Duncan is the father of Bob, husband of Linda, and brother of Mel in Good Luck Charlie. He fell in love with Mrs. Dabney. But when they were left them alone for an hour, they had an argument and began to hate each other.
- He has two siblings, Mel and Stanley Duncan (Bob's two uncles).
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: Colorado | Kwikki Chikki | Super Adventure Land
Songs: Hang in There Baby