First-grader Montgomery Gerald Morris enjoys an exciting year as his class acquires a pair of parakeets as pets, he loses his first tooth, and he becomes a big brother.
When her brother Matthew is born Dilly's parents give her a diary to record her feelings about him, and over the course of two months Dilly begins to change her mind about being a big sister.
Eight-year-old Cassie Witting is upset when she finds out that her mother, Sarah, is expecting a baby, but writing in the journal that belonged to her brother Caleb helps her sort out her feelings and understand that Sarah will always love her.