I don't get the parallel of these characters with the characters from the movie, except the voice of Stewie which was pretty spot on, and the animation, although did serve it's purpose, did seem pretty stiff and somewhat lazy, like how there are 0-1 inbetween frames and just a jump-body-cut transition, which makes it seem too quick and dodgy.
Regardless, pretty good for an exercise, and the lip syncing was alright. Keep improving.