If she refuses to give up the OM, then call the OM and tell him to pick her up. I think you need to do something drastic to shake things up. She's endangering the livlihood of your kids with her thinking like that.
I would lay it on thick and tell him everything that your W wants to do with him. Cut off all money ties from her so that she doesn't use it to further the affair.
She can't keep treating you like a doormat.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.