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He is just like any other father in the world. He loves and cares about his  and entrusts them with their baby, Charlie Duncan and probably Toby Duncan He is also often made fun of by his family for his weight problems, especially his son, Gabe Duncan He also like to eat a lot and refuses to exercise.He did try to exercise once but only lost 2 pounds Gabe's 12-½ Birthday.

He is occasionally shown to be quite cheap.

Personal life

Amy goes back to work, entrusting her kids to take care of Charlie Duncan But when Bob falls down the stairs and hurts his buttocks, PJ Duncan has to drive him to the hospital and Teddy Duncan has to take care of Charlie Duncan In the hospital, PJ Duncan pretends to be a doctor so as not to be identified, but his disguise is ruined when his mom finds out. She says she can't handle it anymore, but Bob Duncan tells her that everything's gonna be okay Study Date. Teddy Duncan tells her parents that they needed a break from baby Charlie Duncan and that they should go out on a date. But then PJ Duncan takes Charlie Duncan to the park and accidentally swaps strollers with a girl named Emma, and brings home the wrong baby. They do everything they can to retrieve the baby, but in the end, they are caught by their parents and get grounded Baby Come Back. Amy Duncan and Bob Duncan anniversary is coming, Teddy Duncan wants to give them the best day ever, but because of her sibling causes problems Butt Dialing Duncan's. She is very excited about this.

It's revealed in Double Whammy that when he was younger he greatly resembled his son PJ Duncan only to stop looking like him when he turned 25.

Bob Duncan used to be part of a band called the Bob Duncan Experience before he was kicked is said that he got kicked out because of Amy always wanting attention.

Bob Duncan lost weight during the third season.