Board Thread:Comic, Novel & Other Discussion/@comment-3125844-20131022005437/@comment-5189167-20140113030755

I think we should all just assume that everything that doesn't conflict with the show is canon. I think they are all related, but obviously there will always be some continuity mistakes. Of course, if it is declared non-canon by an official Grimm person, then it will be non-canon. Until then, assume it is.