Board Thread:Speculation House/@comment-193.1.165.1-20151116214357/@comment-4010415-20170213194825

64.129.4.130 wrote: I love the theory that Qrow is the real father don't listen to some of these people. You can love a theory, but that doesn't make it canon. Usually, when people present a theory here, we assume they're wondering about how likely it is to be canon, so we go over it, look for holes in the theory, look for things that support it and things that disprove it, and post an analysis.

We are 99.9999999% certain that Qrow is not Ruby's real father. If he is, then Yang is a product of incest between Qrow and Raven, which I doubt CRWBY would do.

The RWBY crew has never intentionally outright lied to us, and Monty had no reason to lie about Ruby and Yang being half-sisters, nor much reason to tell us about that in response to the question he was asked ("Is Summer one of Yang's 'many names' that she mentioned in the Yellow Trailer?" The response was that Summer is Ruby's mother and Yang is Ruby's half-sister).

You are free to love the theory, but it's most likely not canon.