When Kari Baxter is assigned an essay about what she wants to be when she grows up, her mind goes blank. She doesn’t want to grow up; she wants everything to stay just like it is. But Kari comes to realize that while making time stand still isn’t possible, she can enjoy every moment with her best family ever. Meanwhile, Ashley Baxter feels the same way. She is worried her siblings are growing up too fast. When she wins the role of Wendy in her school performance of Peter Pan, Ashley gets an idea. Maybe she and her siblings can pledge to never grow up at all!