What does francis say about atticus how do his comments illustrate that racism exists not just in the other residents of maycomb but within the finch family as well?

In the book To Kill A Mockingbird, Francis taunts Scout by calling her father Atticus Finch a "n. ig. ger-lover," and that now Atticus will be the ruination of the family. This comment brings the racism that was previously seen as an outside problem into the Finch family. The court case highlighted underlining racism in the town of Maycomb but Francis' comment showed that racism was also deeply rooted in the families of Maycomb.