Jem said quietly, “My sister ain’t dirty and I ain’t scared of you,” although I noticed his knees shaking.
– Harper Lee
To Kill a Mockingbird, Chapter 11. Jem to Mrs. Dubose, when he goes to her house to read to her and she calls Scout his “dirty little sister.” Children are afraid of the nasty old lady in a wheelchair, but Jem has the courage to stand up to her when she has a go at his sister.