In 'To kill a mocking bird',what is the relationship between Jem and Scout and how it changes with time?

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Hi, Bilkiss!

Also, if you read and study information that you'll find on sites that you can find via clicking on the following searches, you most likely will find your answer.

To Kill a Mockingbird Synopsis - Google Search

To Kill a Mockingbird Synopsis Jem and Scout - Google Search

Thanks!