Board Thread:Speculation House/@comment-27963514-20160313063534/@comment-26397825-20160313065046

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Miles has specifically stated in a Livestream that Qrow is not Ruby's father, and has asked fans to stop bringing it up. That's how often it has been thought of and bandied around the internet. It's in the trivia on Qrow's page, including a link to the video he says it in, if you're curious.