I think what you need to do is talk to your W about your kids. Especially if they are going to be staying with her. In her state of mind, don't be surprised if she starts twisting things around and make you seem like the bad guy.
Tell her that her action of not responding back to the kids are hurting them. And just tell her how THEY feel. Do not include you in any of it. If she starts going back to talking about you, go back and guide back to talking about the boys. Draw that boundary for the kids.
Take care.
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.