I've skimmed all of your posts and can't find the ages of your kids. Since you've been married for 20 years, I'm supposing and hoping that they're older. You've already stated that none of them are jws, studying to be jws or even attending the meetings, so at this point the kids must know that something isn't right with their mother's religion. Plus they've probably noticed how weird their mother becomes when she's a gung ho jw.
Educating your kids about cults, the Watchtower cult in particular, is not turning them aginst their mom. Just be honest with them, and say that their mom is going to be very angry at you for a while, because you will not permit her to take them to the meetings. Then ask them if they know why you are doing what you're doing, and go from there.