Calpurnia is the Finch's black cook/maid. She is NOT a slave. She's like the motherly figure to Jem and Scout. She takes care of them and displines them as need. Cal is like Atticus's right hand throughout the book. She is very active in the black and white communities, so she expierences all of the issues going on without the book. Throughout everything Cal just wants what's best for the children and for them to be fine and not dragged into the trial.