xDD Well, considering Serena's just arrived and starting at the very bottom, seems like she would have to answer to him. Mind you, she won't like it and will try to get out and climb the ranks as quickly as possible...

Her parents (and the rest of the Sinclaire line, which isn't very long) lived on-Deck until about 24 years ago, actually. They had Serena and then mysteriously disappeared, leaving their daughter to live with her aunt and uncle off-Deck. If Chives had heard of them, it would probably be from his father.