Board Thread:Speculation House/@comment-14138255-20130921015754/@comment-1618120-20130930145837

To me, Crimson looks quite young, like in her mid 20's in my opinion. If Ozpin is Ruby's father or in any way related to her, I'll be pissed.

In my opinion Ozpin knew Glynda as a student of his and he basically taught her. However, she moved on to the dark side for some unknown circumstance. This is very hinted as his speech "in need of purpose--direction. You assume knowledge will free you of this" Maybe Crimson thought knowledge freed her of purpose, so she ended up on the dark side.