Board Thread:Speculation House/@comment-1996340-20130815235115/@comment-32390199-20130823093209

I think it is a relative of Ruby. It also reminds me of the Grimm fairy tale Snow White and Rose Red. They were twin sisters and one wore red and her presence always could be noted in the room, she loved adventure etc. just like Ruby. The other one however was more quiet and loved books etc.

So I see a possibility of a lost twin sister could be possible too. Maybe the last relative she had before she was adopted by the Xiao Longs. Or if Yang is the adopted one, that Yang was also adopted so Ruby could have a sister again. This also could explain why she is so attached to Yang because she doesn't want to lose her sister.