My first wife has disappeared, to somewhere, my kids don't know where she is, and they prefer it that way. She got onto some weird religious kick at some point and thought the world was about to end, imminently, back a decade or so. My own situation was such that a divorce was absolutely necessary for my kids. They didn't tell me some of the stuff that happened when she had them (every other weekend) until much later, fortunately, I would have gone to child services and tried to cut off her contact.