Who is Jem in To Kill a Mockingbird by Harper Lee?

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Jem is the older brother of the narrator in To Kill A Mockingbird. He is four years older than his sister, Scout. The two are the only children of Atticus Finch, a white lawyer. At the beginning of the story, Scout recounts how Jem's arm was badly broken just before he was thirteen, which left him with a slightly shorter left arm. However, to Jem's great joy, he was not prevented from playing football in the future, as he had feared.

The brother and sister pair is the focus of most of the activity in the book, as they generally do most things together, even though Jem pretends to be irritated sometimes by his younger sister. For the most part, Jem is (while sometimes pushy) an affectionate and caring big brother.

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The young narrator of To Kill a Mockingbird by Harper Lee is Jean Louise ("Scout") Finch; her older brother is Jem Finch. They are the daughter and son of Atticus Finch, and they live in Maycomb, Georgia. 

We meet Jem in the opening lines of the novel, where we learn his age at the time (thirteen) from Scout who is looking back at the events recorded in the book. During the year Jem was thirteen, his arm got broken at the elbow and, like many teenage boys would have been, he was worried that he would never be able to play football again; however, he soon recovered.

His left arm was somewhat shorter than his right; when he stood or walked, the back of his hand was at right angles to his body, his thumb parallel to his thigh. He couldn’t have cared less, so long as he could pass and punt.

Throughout the novel, Jem is Scout's partner in crime, her bossy big brother, and her companion. 

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