Board Thread:General Discussion/@comment-27121579-20151030110310/@comment-26339753-20151030233011

Shadow at Morning wrote: Yang knows what her mother looked like, and suspects that her benefactor was her (if only subconsciously). The whole point of the exercise is to breathe new life and urgency into her quest for her mother, and have her obsession slip her control.

And you dodged my question. Until someone can show me that dreams in RWBY have any supernatural elements, they remain bog-standard dreams generated by the subconscious. Point granted for the standard dreams. So almost certainly, then, Yang is not aware of the fact that Raven is not her mother.