Family Guy is official know as lousy clone from "The Simpson"
see the Mad Magazine sardonically annual 2001 TV award for "TV's Most original Animated Series".
McFarlane was on way to NY to get the Award by Adam Sandler, as 9/11 happened.
even Seth McFarlane had lived, i have my doubt that Family Guy would be become a success.
Like Fox had with The Simpson spinoff "Futurama" (about last members of Simpson family in year 3000)
sonner or later he & scrip-riders had run out of Ideas, maybe he start to rip off famous movies.
like competitor "Robochicken" and there brilliant spoof on Star Wars.
Or McFarlane had restart old animated TV shows like Yogi Bear, but with real actors.
(see his controversial interview at San Diego Comic Con in 2000)