OMG...I feel for you when it comes to the meddling MIL....She was a big big part of our seperation in 2007...I actually asked my lawyer if I could divorce the biotch. insted of my hubby. He laughed and said NO...sorry, and that was the first time he had been asked that ?
I'm sorry your passive / aggresive hubby is responding this way..
The best thing I ever did was ditance myself from his MOM. Tell her the next time she calls that you won't discuus your realtionship with her regarding her son ( your Husband )PERIOD
I would stop the contact with your husband at this point......I know you have a child involved so going dark / black is not possible, but all interactions should be short percise and be willing to be the first one to say Over and OUT.