It is easier to focus on drama than it is to feel your own pain. You will have to feel your own pain at some point. Do yourself a favour and concentrate on you being a healthy and noble role model for your kids.
Don't interfere with the OMW's family. they know the facts now. There's nothing you can (or should) do to help. It could blow up in your face at the very least.
Leave it alone. Dusk said it very well. I just wanted to chime in so you have another opinion.
** Purple
As soon as you trust yourself you will know how to live. Goethe