I did a little cleaning and wash today, and afterward I laid on my bed and listened to some music on my stereo, and had a little to drink. A though occurred to me. "Family guy" and to a lesser extend "American dad" are just rip offs of the Simpson’s. Think about it: the fat, alcoholic father, the bad, loser son, the nerdy, somewhat misunderstood daughter, and the seemingly loving, hardworking housewife. I never really cared for family guy’s low-brow humor anyway, but, stewy is awesome.
But that is the nature of TV and life, for every market there is a counter-market, and people will try and rip off something successful so that a little success rubs off on them.