Board Thread:Speculation House/@comment-33400028-20180531011504/@comment-4010415-20180531045716

Bipolarbear1494 wrote: ​​​​​ '''Now let's move on to how Ruby IS blood to Qrow. Tiayang in the episode stated above had a simple line. "Don't encourage them you know they get this from your side of the family." When he said this he was talking about BOTH Ruby and Yang. This points to that Ruby shares blood with Qrow. (By how people normally use this saying at the very least.) '''

I think you missed the point of the joke... And yes, it was a joke.

The joke was that Qrow is their mother.

They were playing it as a stereotypical argument between father and mother at a parent teacher conference.

Neither of the girls' mothers are around - due to one leaving and the other either disappearing or being dead - but Qrow was around, enough for Ruby to bond with and idolize him while Taiyang was too depressed to be a father to her.

Even fans have made jokes about Qrow being Ruby and Yang's mother with fanart where Taiyang and Qrow act almost as if they're married.

That's all it is, a joke that pretends Qrow and Tai are married because they both took part in Ruby and Yang's upbringing due to Raven's absence and Summer's death.

In case you missed it, Miles Luna (one of the series writers) outright blatantly stated that Qrow is not Ruby's father and that she just looks up to him enough to imitate him. Here's where he said it.