Jem demonstrates maturity in chapter 15 when a lynch mob surrounds Atticus outside of the Maycomb jailhouse. After Scout runs into the middle of the group of men, Atticus instructs Jem to take her and Dill home. However, Jem recognizes the gravity of the situation and refuses to leave his father's side. Jem's disobedience demonstrates his loyalty and courage. Jem is determined to remain by his father's side during the threatening situation, which is an extremely mature, courageous decision. Fortunately, Walter Cunningham tells the lynch mob to disband and nobody is harmed.
Jem also demonstrates maturity in chapter 23 by preventing Scout from arguing with Aunt Alexandra and getting into trouble. Scout becomes furious when Aunt Alexandra calls Walter Cunningham Jr. trash and is about to retialiate when Jem intervenes. Scout mentions,
I don’t know what I would have done, but Jem stopped me. He caught me by the shoulders, put his arm around me, and led me sobbing in fury to his bedroom. Atticus...
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