In To Kill a Mockingbird, how is Scout influenced by her brother Jem in the story?

Scout is influenced by her brother in a variety of
ways.

First, Scout wants to do what her brother does, even
at the risk of her own safety. For example, Scout goes to the Radleys late at night with
Jem and Dill even though she doesn't want to. She does it because the boys start to call
her a girl and treat her like she is scared. She refuses to be pushed around or out of
their circle of friendship. So, in spite of being afraid, she
goes.

Secondly, because Scout doesn't have a mother, and
spends most of her time with Jem, she likely gets her "tomboy" tendencies from this
relationship. The two like to play in their treehouse together and the two are excited
about their air rifles from Uncle Jack at Christmas together. These boy activities
influence Scout to act more like a boy than the girl that she is forced to play by the
end of the story at the Missionary Society Circle.

Scout is
affected by Jem's every emotion. When she can tell he is being dared by Dill to go touch
the Radley's house in the beginning, Scout senses his apprehension but knows he won't
back down from a dare. Throughout Jem's quiet times and moody times Scout knows to leave
him alone because he is either thinking about his mother or the
trial.