Peter and Lois have two sons, Stewie and Chris.
It was revealed in The Juice is Loose that Lois and Peter had a third son, Peter Griffin Junior that Peter apparently accidentally killed after shaking him to hard.
There are also Jake, Tom Tucker's son.
Cleveland Jr, Cleveland's son.
Patrick, Carter Pewterschmidt's son.
Neil, Mort & Muriel's son.
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There have been many "little boy" characters on Family Guy but I'm going on a hunch you mean Stewie.
Theo Rossi
Family Gay is the Family Guy episode that Peter gets a horse in.
family guy
Cleveland isn't on 'Family Guy' anymore however his wife's name was "Loretta", his current wife's name on 'The Cleveland Show' is "Donna".
Stew-Roids