"Do you think so?" It's not a statement intended to start an argument, or disagree with her. There's no defiance in it, but he does his best to keep a hint of desperation out of his tone, something that might sound strange coming from a Stark. He's only heard one story about Rhaegar, a story about kidnap and rape, and he knows now that it's not a true story.

She never met her brother, but she seems to know something about him.