Board Thread:Speculation House/@comment-3257939-20131111020445/@comment-92.4.166.162-20131111200630

DiegoAnime3000 wrote: So what's the deal with Ruby and Yang?

I read somewhere that back in June, RWBY's Crew said that they are not blood-related but Monty tell us via Twitter "When did I ever say Ruby and Yang aren't related." and that neither of them is adopted. Maybe it's as simple as not being 100% blood-related, if they are different in appearance then it's because they inherited their looks from a different parent but the other one remains both girls' parent.

My best guess is that Dad married twice, and why dad? Because Summer Rose may be Ruby's mother while Yang has a different mother, maybe that's the woman in the photo who went missing or even abandoned them and now she is looking for her. Also the way Ruby said: "You sound like dad".

Whoever they are, I can't think of another reason that explains why Ruby and Yang are not blood related, have different surnames, completely different in appearance and yet, neither of them is adopted and their relationship clearly tell us that they have been together since birth. But, if they both shared a father, that would make them blood related.