Moose’s older sister, Natalie, is autistic, and this story takes place in the 1930s, a time when people who were not neurotypical weren’t understood very well. When Natalie is rejected from the Esther P. Marinoff School, her parents decide to have her spend her time tagging along with Moose. He is initially frustrated by this—what twelve-year-old wouldn’t be?—but he rises to the occasion. Like any brother, he is protective of his sister, and he knows what to do to make her feel safe (even if that just means letting her organize her box of buttons). When Natalie is afraid to get on a boat, Moose is able to take her mind off it by prompting her to recite the index from a favorite book. He also stands up to his mother and lets her know that it's not right to be dishonest about how old Natalie is in an attempt to justify her behavior. Above all, he is compassionate and willing to stand up for his sister, and these qualities make him a good brother.