Board Thread:Speculation House/@comment-108.69.217.22-20160216061533/@comment-26018514-20161228064656

that's not a mystery:

Qrow and Raven are twins,

Taiyang is both Girls father,

Summer is Ruby's mother.

Qrow is Yang's uncle biologically because Raven is Yang's mother

You DO NOT tell your daughters that they are not related to someone they(and you) consider their uncle... like Qrow, when the child that he is related to, is only 2 years older than her.