As much as any outsider can, I understand what you're going through.
My sister's husband served her with divorce papers on their twenty-seventh anniversary a few years ago. Since then, I've seen him at his daughter's wedding and perhaps one other occasion. And I've seen first-hand the damage he's done to my sister and to their children. Any respect I had for him as a man, a husband, and a father is gone. I told my sister that if she wanted me to, I'd get a baseball bat and work him over. She hasn't given me the go-ahead yet, but I'm still hopeful.
I don't know all the circumstances of this situation, of course, but I'm very sorry you're going through it. I can only hope and pray that all of your, working together, find your way back to each other. I hope you have a strong network of friends who will stand with you. And I hope you get the best legal advice possible. I also hope you have a qualified counselor who will help you face this tragedy.
May you find light even in this dark time. And may you be loved even as you love.