OP...
I grew up in the JW cult... age 4 to age 41. I was in deep as a single elder with lots of responsibilities. I started having doubts in 1991, but buried them. In 2002 I attended the 8 week MTS. There the scales fell from my eyes, as I seen the hypocritical behavior and speech of men who were supposed to be the "cewam of the crop", but it was another 5 years in 07 before I left for good.
I give that brief history [many here know how long winded I can be], to show that it can take years, or decades, for someone to be ready to leave the cult. I knew something was fishy. It took an ethics class in college in 06 to push me out for good.
I cannot imagine going through the mental turmoil you are going through having a JW wife and young kids. It was difficult enough being single. BUT DO NOT GIVE UP ON HER. More importantly, DO NOT GIVE UP ON YOURSELF.
If you figure out happiness and live it, it will sink in, if she really wants it.
Ultimately, protect yourself and the kids. Good luck
Snakes (Rich)