Are Stan Smith and Joe Swanson the same character, but just alter egos or related. He looks like Joe, but with Quagmire's chin and hair. I, for one think this is intentional. :
Stan Smith vs Joe Swanson by BLA5T3R on DeviantArt
Guтı on Twitter: "¿A quién se parece más JORDI ROURA? RT Stan Smith (American Dad) FAV Joe Swanson (Padre de Familia) http://t.co/8VwS708EXC" / Twitter
Latest Stan Smith GIFs | Gfycat
Family Guy - Joe as Stan Smith - YouTube
Joe Swanson [Super Smash Bros. Ultimate] [Mods]
The Movement | Family Guy Wiki | Fandom
Stan Smith Peter Griffin Roger American Dad! Steve Smith, family guy, hand, people png | PNGEgg
American Dad! | Family Guy Wiki | Fandom
Family Guy | Peter Griffin's Secret To Workout | FOX TV UK - YouTube