dopey undependable dad peter griffin. >> don't worry, kids.till going to put food on this table. just not as much so it might get a little competitive. no, no,. >> reporter: brian, the griffin's martini-loving talking dog. >> pervert. oh, don't flatter wrowr self, honey, i don't have any sweat glands. >> reporter: and stewy. now i shall end your oppressive reign of mate remarkal tyranny. >> reporter: and the baby who is bent on killing his mother. >> why don't you play in the other room. >> why don't you burn in hell? ell, no dessert for you, young man. >> reporter: you may not get the joke but millions of fans do. why is the baby's head shaped like that? >> his head is shaped the way the voice sounded like the character should look. when i developed that character, the voice came first. >> reporter: with your head shaped like that, how was childbirth for your mother? >> you know, the initial evacuation was rather difficult. >> reporter: the series is based on his college thesis project at rhode island school of design. >> some nut in his unde