By telling us who the Finches are, the author gives us a sense of where they fit in. At the same time, she gives us an understanding of how Atticus is something of a rebel because he does not take his expected role in society -- he doesn't act like part of the elite.
In the story macbeth had said it
Yes , around 25 - 100 km ( based on where you live)
The theocracy that ruled Puritan salem