What role does Calpurnia play in the family and in the novel?

Calpurnia is a surrogate mother to Jem and Scout who teaches them about good manners, hard work, and honesty. She takes care of the family’s needs, and Atticus trusts her unequivocally. She is also the narrator’s window into Maycomb’s African American community. She takes the children to her church one Sunday, and, because of this, Scout and Jem can sit in the “colored” balcony during Tom Robinson’s trial. She helps Atticus comfort Tom’s wife, Helen, and she knows how to read and write, which is uncommon in her community.