Why in the book did a sister respectfully touch her brother's genitals to feel sorry for him?

It seems you might be referring to a specific scene from a book that may involve themes of intimacy, boundary exploration, or complex family dynamics. However, without knowing the title of the book or the context of the scene, it's difficult to provide a precise explanation. In literature, such scenes can often serve to explore deep emotional connections, vulnerabilities, or conflicts within relationships. They might aim to portray a sense of care or sympathy in the face of trauma or hardship. However, this type of content can be sensitive and is often interpreted in various ways depending on the narrative and the characters involved. If you provide the title of the book or more context, I could give you a more tailored analysis or explanation.