She has several siblings but only one other sibling is a Witness. The others have had their lives turn to crap: prison time, alcoholism, unwanted pregnancies, and divorce. These things are clear evidences to her that the WBTS is correct and those who fall away from it are doomed to a life of pain and suffering.
It almost sounds like you're married to my wife...
Welcome to the board EasyReader. Sounds like we are in a similar boat (cept I don't have kids). But I did tell my wife. About 3 years ago I confided to her that I had doubts. It took me up until last month to announce to her and the world that I am no longer a JW.
If I may suggest, you should level with her. It's not healthy to live a lie. And then you know where you stand. As has been said, if she follows the WTS, according to 1 Corinthians she cannot leave you, unless you actively discourage her from her faith. Maybe after some time she will come around.
My wife is as diehard as you can get, and we are former missionaries, so I might be following in llbh's footsteps soon.
A@G