User blog comment:CNBA3/Luffy's Mother Theory!/@comment-25926617-20150326235905

I would be willing to bet a small amount of money on this. I think that maybe Dragon fell in love with a princess and what not they kept it secret and then she had Luffy and then the WG then killed his wife and then he gave Luffy to Garp so they wouldn't associate Luffy with him.