Mumin, I know it [censored]. This is one of the things most LBSs struggle with related to OPs in their sitches. I feel for you man. And I know if I were you I'd be tempted to take action as well. But you need to try to focus on what you can control. And her and who she brings into your kids 'lives isn't it. I think you're trying to find a way to control what you do not have the power to control.
If you do bring it up be prepared for defensiveness and anger. It rarely goes the way we think it will when we are considering the action. And it likely will change nothing.
M(52), W(53),D(17) M-20, T-23 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018