He sounds like a super A...hole. I would document the children in the pub, document as much of his addiction related stuff as possible. Gove the kids a camera and let them take nice photos with their dad at the pub. Nice influence on children.
Had the displeasure to enter a conversation with some grown men one of which was upset with his girlfriend. Seems while on the bed asleep he managed to shoot a significant amount of urine into her pocketbook. She was not happy about it. He spoke like it is completely normal to pee while u sleep.
Alcoholism can really cause a lot of demented sh....t. I was happy to excuse myself and walk away from those guys.