Jem and Scout Finch are typical siblings, and they often annoy one another to no end. Yet if Scout is upset or threatened, Jem's protective nature kicks in, and he stands up for and comforts his sister.
On the night of the fire at Miss Maudie's house, for instance, Atticus tells Jem to take Scout and go stand down the street. The wind is blowing, and the fire might spread to neighboring houses. The fire truck is nearly out of commission, and nothing seems to be going right. Scout is terrified. Jem puts his arm around his sister and tells her, “Hush, Scout. It ain't time to worry yet. I'll let you know when.” As the situation intensifies, Jem keeps his sister close and continues to tell her not to worry until the danger is finally over.
When Atticus spends a night in town guarding Tom Robinson, Jem, Scout, and Dill go to see what is happening. Scout runs toward her father, who is confronting the mob, and Jem yells and tries to catch her to hold her back and keep her out of danger. Of course, in this incident, Scout saves the day. The kids are still concerned about the upcoming trial, though, and Scout can't sleep. Jem hears her and takes her into his room to comfort her, knowing that she doesn't want to be alone.
Of course, when the children are attacked by Bob Ewell, Jem does everything he can to protect his sister. “Run, Scout! Run! Run!” he yells as soon as he notices the danger. Scout falls, and Jem pulls her up and tries to get away. Boo Radley comes to their rescue, but like Mr. Tate says, all Jem “wanted to do was get him and his sister safely home.”