Board Thread:Speculation House/@comment-24.247.91.107-20140511154823/@comment-4964668-20140803005458

I think Rose is their mothers maiden name, and Ruby uses it as a tribute, or maybe Xiao Long isn't really Yang's last name (she did say something about having several names).

As for their looks, maybe one looks more like their dad and the other looks more like their mom, or maybe one inherited some recessive traits from one (or more) of their grandparents.

Honestly the diffrent last names were the only things making me question Yang and Ruby as sisters, I have two cousins (who are full blooded sisters) and they look even less alike then Ruby and Yang do (older one has brown hair and brown eyes, younger one has blonde hair and green eyes, and she's taller)

I have two more cousins (on my mother's side, full brothers) and other then having the same hair color (black) they look nothing alike at all