Board Thread:Speculation House/@comment-3257939-20131111020445/@comment-70.195.192.115-20131111021255

Because reasons? To put it simply neither of them has to be adopted for them to have different surnames, Yang is born one of her parents dies or they get divorced, two years after Ruby is born kne or the other happens, parents get remarried boom sisters. Seriously there are a lot of real life stiuations that can actually answer that question, it's just while they exist they tend to get overlooked.