User blog comment:Zathronas/Analysis by an author: Volume 2 episode 6: Burning the Candle/@comment-10390252-20140905091829/@comment-25091485-20140905093118

Losing someone you love twice over would probably hit him really really hard even if Qrow didn't beat him to a pulp, so yeah, he probably never recovered from that. And thats kind of supported by the lack of information of him and the lack of impact of any of his current actions. For example, we don't have him training Ruby to be a huntress, but instead Qrow training Ruby. (And's there's no mention of him training Yang, despite being a teacher at Signal and probably a pretty decent huntsman, to be a teacher)

Well, the only info we have about their father is that, they (him and Summer) always told Ruby to do good and hence, Ruby wants to be a huntress.