Frank Duncan is Bob's father, Linda's ex-husband, Mel's brother, and PJ, Teddy, Gabe, Charlie, and Toby's grandfather 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 is played by Alan Rachins.
Trivia[]
- He has two brothers named Mel and Stanley (Bob's two uncles).