Board Thread:Speculation House/@comment-226878-20140810021742/@comment-96.254.157.84-20140906035703

Could be, though I think Qrow is the father's brother since Ruby and Yang both refer to his as uncle. Yang didn't know Summer wasn't her mother until after Summer died, so she wouldn't know that Qrow is her uncle if that were the case.

I know someone will argue it is because Qrow is a close family friend, but this is just my opinion.