Board Thread:Speculation House/@comment-24.247.91.107-20140511154823/@comment-14909251-20150728233135

ChishioKunrin wrote: That and...

a) The adults never told Yang and Ruby Qrow's last name.

b) The adults did let Yang and Ruby know Qrow's last name, and the girls didn't think anything of it because they both have different last names but are related.

c) They didn't care about his last name. He's a close friend of their dad's who's really nice to them, acts like an uncle figure, helps take care of and look out for them, and bonds with them.

There's a married couple who're close friends with my parents and went to high school with them, and I refer to them as my aunt and uncle. I have for many years, despite knowing they're just my parents' friends. Well, Yang would have learned that Qrow was her biological uncle around the time Summer died and they were both pretty young at the time based off Yang's flashback. Not as likely for them to develop a serious curiosity about the name issue. As it concerns Ruby, it just depends on whether she knows about Yang's mom. I can scarcely imagine she does not know and I do not believe Yang would have kept that from her. She may be keeping her efforts to find her mom from Ruby, but the bit about them having different mothers is probably something Ruby has known for a while.