Board Thread:Speculation House/@comment-14138255-20130921015754/@comment-3257939-20130926011521

Maybe not a father but instead a grandfather. Ozpin looks very old considering that his eyebrows are brown and his hair gray. If he is Ruby's grandpa, maybe he tried to save his daughter but failed and she died without telling him that he's got a grandchild. Now, when he first saw Ruby and noticed that she looks like her daughter when she was a child, especially for the silver eyes, he saw a chance for redemption so he's trying to make sure Ruby grows into a great huntress.

And I support the theory about Ozpin being a teammate or mentor for Crimson just like Pyrrha and Jaune but then something happened and she became evil. It reminds me to Jiraya from the anime Naruto where he trained a guy who became the leader of a cruel organization who tried to rule the world and his teammate and friend became a murderer who tried to become a god.