When Jack's mom and Jack get home, they find holiday cards from Julian's family and August's family in their mail. Jack thinks that August's card, which has a picture of Daisy on it, is cute. He tells his mom that he heard that Julian's mom edited August's face out of the class picture. Then, Jack tells her why he punched Julian and what happened on Halloween.
The revelation that Julian's mom edited August out of the class photo shows that this kind of nastiness and bullying isn't even confined to school-age kids, since clearly adults engage in the same kind of behavior. In this way, the novel suggests that some people never truly learn how to be kind.