American Dad came after Family Guy was on hiatus.
Below are featured images which depict multiple characters barefoot simultaneously
S3e? "The Magnificent Steven" has a close up of Hayley and Francine in sandals.
S3e? "The Vacation Goo"
S3E16 "Spring Break-Up" shows 4 drunken college students walking while wearing sandals.
S6e2 "Son of Stan"
S6e18 "Flirting With Disaster"
"Can I Be Frank (With You)" shows Victor (a female in a boyband) barefoot while in pajamas.
"Da Flipitty Flop"
S9e15 "Honey, I'm Homeland"
- s12e9 "My Affair Lady"
Hayley Smith and a fat woman are barefoot onscreen simultaneously.