Board Thread:False Info and Speculative Discussion/@comment-15875337-20140729210414/@comment-75.147.224.33-20140729212712

The only ones who supposedly know the truth about Malia at this point are Scott, Stiles, Lydia, Kira and Peter (correct me if I'm wrong).

Talia erased the memory of Malia from Peter and Derek, but maybe there are other family members who know about her. Deaton was an emissary to the family, so maybe he knows (I'd rule him out as the Benefactor, though). Beyond that, it's hard to say.