Eight-year-old Mason writes and illustrates his own superhero series, "Invincible Igor." Tonight his goal is to finish book six in the series. But with all the interruptions, how can he? His six-year-old sister, animal-loving Alicia, needs Mason's drawing and spelling skills to make a sign that will keep her "pooping machine" guinea pig safe. And now there is a racket coming from the bathroom, thanks to his youngest siblings - four-year-old twins,...