Just crossed my mind, have you called an AA counselor to ask about intervention???
Maybe if his family REALLY is on your side, and understand alcoholism they might all help with an intervention. However that said, families are funny. It might be a slow process to get everyone on the same page. Good if his boss likes him and would want to help also. This only if you still love him.
I would go slow with family and ask their opinion, like" Have you ever heard of intervention?? Then, "what do you think, do you think it would work, would anyone want to help"?? etc.
If in your gut you think you and kids would be better off without him, then I hope you find a plan as even after intervention and treatment some do not make it.
just thought I would mention this, again you have to go with your gut feelings.
Get latest updates on intervention, see if and how often they work, also I can't remember has he been thu treatment and done AA??
Maybe I am off base here, but will send anyway .
Wanting the best for you always. clancy46