Yuya perks up at that. Okay, maybe her parents were dead but she could still connect with her sister. "Who is she? Are you going to find her?"

He asks, assuming she hasn't even met her yet. Rita sounds like she was so alone, and only recently started finding friends. And if it took reading a book in a magic library to learn who her father was, she's probably disconnected from all of them.

It's kind of sad, but Yuya keeps his focus on the positive aspects of it.