[quote=Kidd]
I do believe word of God stated that they are indeed blood related. The mystery for the fans at the moment is "how?"Personally, I think they're half sisters--different moms, same dad in my mind. But I guess we'll find out eventually
[/quote]

Yea considering that one is bright blond with an Asian name (but looks Caucasian) and the other is a black/reddish head (also looks Caucasian). I think they did mention in the start of season 1 about a father but I cant remember exactly I'ma watch it again.