Your W and MIL just seem to want to be picky about everything!!!
I have not been able to really respond to either of them on this last bombastic diatribe. There really is no response to the sheer insanity of what MIL wrote and W agreed with. As long as they continue to live under the same roof they're going to continue to spur each other on to greater and greater hyperbolically paranoid delusions. I am realizing there is nothing I can really do about it, except trying to smile (weakly as it is) and move on. I just don't want to appear to be a doormat or punching bag either.
The part that really worries me and gets me down is that this is the environment to which my two little boys have been regularly exposed. W swears she never denigrates me in front of our S's, but then she's lied about so much other stuff. And she cannot be so sure of her mother's behavior though -- I certainly don't trust her.