Board Thread:False Info and Speculative Discussion/@comment-24.187.28.16-20140814181739/@comment-25176701-20140814190122

Peter may have known Lydia's grandmother was a Banshee, however, I don't think they actually knew each other and talked with one another before.

Peter probably knew Lydia was a Banshee because the bite didn't take effect and she didn't heal immediately like how the others who were bitten did.