Mom's Trip is an episode.
Brenda has to travel to New York City for the day to attend a work related day long seminar. Little Bill worries that he will miss her too much, and that they won't be able to do the usual things they do together, like take his bath or make dinner. Big Bill explains that Alice the Great is preparing supper, he will give Little Bill his bath, and that Brenda will be home the next morning. April and Bobby try to cheer their brother up by playing his favorite board game, but Little Bill frets about what to do with the piece Brenda plays with. His siblings say he can use both pieces to feel like he's playing the game with their mother, and he perks up when he wins. Brenda calls during dinner to check up on everyone, and they all tell her how much they miss her. After his bath, Little Bill joins Big Bill on the couch because neither one can sleep while waiting for Brenda to come home. They nod off sitting on the sofa, and Brenda gently wakes them up when she comes in the next morning, saying she kept her promise to be home at the appointed time.