BEAUTIFUL MIND- You really handled that well, very well indeed. Good job. The thing that's not fair is that our JW relatives expect us to respect THEIR rights to believe as they want- but they don't respect OUR rights to believe as we want. In fact - JW's don't recognize personal boundaries at all actually - they are just drilling us with intrusive questions in order to get the " goods " on us in order to judge us according to our answers to their questions.
It will be your mother in laws loss if she shuns you guys and her own grandchildren. You did well to stand your ground to her. Now about all you can do from this point forward is try to avoid getting caught up in what I call her " bear trapper " behavior where she tries to get you to reveal too much and then she brings the ax down on your relationship by shunning you guys. Now that she knows you and your husband's position, and you've stated your views - if she talks again try to just stay on family topics and non-JW topics about health, weather, hobbies, entertainment- otherwise I think it will just increase the tension in the situation . Keep telling her that you guys love her unconditionally and that will never change. Perhaps in her own mind she'll think about that- even if due to pride she won't admit it to you out loud. Gives her something to reflect on compared to how SHE is being hard lined towards you and your husband. I wish you the best of luck. Hang in there I have JW relatives in my extended family as well- I know it's not easy dealing with them. We are here for you. take care, Peace out, Mr. Flipper