Revisits the sometimes challenging relationship between a six-year-old (The Pain) and his eight-year-old sister (The Great One) through seven chapters featuring such events as learning to ride a bicycle, having a birthday party, and dog-sitting.

Third-grader Clementine tries to adjust to the news that her perfect family of four is adding a new brother or sister.

When Jade does well in a track meet, her entire family is excited except Justin, who later confesses to their older brother Jordan that he wishes he were good at something for which people would cheer.

Annie wants to adopt a Chihuahua named Azzie, but her siblings all want less typical pets.

First Phineas and Ferb accidentally create a giant gelatin monster, and then they go to England to visit their grandparents, where Candace tries to find proof of her brothers' activities, while Agent P copes with his own problems.