User blog comment:IamThorn/Tell why Raven is not Yang's mom./@comment-9464517-20150128202120

She probably is, but she shouldn't be, because that would be predictable as fuck.

Then again, Project Predacon made a good blog after the release of Breach explaining why Raven may well not be Yang's mother, so check that out if you're interested: http://rwby.wikia.com/wiki/User_blog:Project_Predacon/Volume_2:_Post_Credits_Scene_Analysis