Jem changes emotionally throughout the book. He starts to go with what he feels in his gut, and begins to grow apart from Scout and Dill becoming more like his father. Jem's first emotional change was when Mrs Dubose died. Mrs Dubose always taught Jem to be determined and preserving and after reading to her Jem became “moody and inconsistent” also Jem became more stereotypical and wanted Scout to be “more like a girl”. At the beggining of the book he doesn't quite know about the world and people but near the end he understands people's motivations and prejudices a bit better.
Jem starts to think like an adult as he gets older in the book. Throughout the book he develops a mind more like his father's. Atticus teaches Jem “Remember it’s a sin to kill a mockingbird.”he later on applies this to the situation where Scout wants to kill the Roli poly bug be he tells her not to. Jem starts to think back to both the Tom Robinson Trial and what his father said to him and realize it isn’t fair to be punished for nothing. “So that's what you were doing, wasn't it?” “Makin' fun of him?” “'No,” said Atticus, “Putting his life's history on display for the edification of the neighborhood.” Jem seemed to swell a little. “I didn't say we were doin' that, I didn't say it!” Atticus grinned dryly. “You just told me,” he said. “You stop this nonsense right now, every one of you.”. At the beginning of the book Jem is childish and is eager to find out what Boo Radley is like so he goes