Jack Harris is Duncan's father. He is voiced by Ty Burrell.
He is a tall, beefy man with red-brown hair, a soul patch, a stubble and a small moustache, he has burly, hairy arms and wears a red flannel shirt with a gray shirt underneath. Light blue jeans that's tattered on the pant legs, and red sneakers.
Jack is somewhat emotionally disturbed. He's interested in Hard Rock music and has a particular insecurity around his attempts to seem 'cool'. Though stated very briefly in "Red Head Redemption," Jack's previous military service plays heavily into his character.
- In "Red Head Redemption", his wife says he fought in the Gulf War.
- In the "Pilot", his wife reveals he only has one testicle and he reveals he has a bad relationship with his parents.
- He is the Harris counterpart of:
- Homer Simpson (The Simpsons)
- Peter Griffin (Family Guy)
- Stan Smith (American Dad)
- Cleveland Brown, Sr. (The Cleveland Show)
- Bob Belcher (Bob's Burgers)
- Bud Buckwald (Bordertown)