OK, Dad...first, a 7 year old wetting the bed is a sure sign of stress. He needs help handling his emotions. You might be able to talk with him and get him settled, or you may need to get him into therapy.
No matter what, don't hesitate. His actions are screaming out that he is in pain. Help him.
Matter of factly, inform W of the situation. I know I would be tempted to heal some guilt on, but don't do it. It could easily have the adverse of affect of turning the attention away from your son. He is in crisis, and needs help now.
