Glad you're here with us, WH, and thanks for sharing.
This is quite a family crisis.
We had this problem (addiction) in my family growing up, and my first wife and I are both alcoholics.
He seems to not want help.
He has had every opportunity to get help and, even if he got sober today, he still has a very low bottom already.
You will get good advice and commentary here.
You need to protect yourself and your children.
Please keep us posted as to your efforts.