How does jem change thoguht the book to kill a mockingbird in to kill a mockingbird?

At the beginning of the book, Jem is still very much a child. Like Scout, Jem has to grow up during the Tom Robinson trial. He struggles to find himself and his place in the world. For example, when Jem runs away from the Radley house and loses his pants, he does not want to tell Atticus where they are.