Board Thread:Speculation House/@comment-97.117.77.25-20180117230750/@comment-34724302-20180307111720

ChishioKunrin wrote: 87.207.184.232 wrote: I too belive in that Qrow is father Ruby, and yee i know that teory die many times but like 97.117.77.25 wrote that argurments i mostly agreed with them, and for me i add. Miles Luna, one of the series writers who helped plan out the entire story of the show, outright blatantly stated that Qrow is NOT Ruby's father. So... game over.

Here is where he said it. And Monty himself confirmed that Ruby and Yang have the same biological father.