You don't need to divorce right now
You tell him you are seperated, relationship-wise as well as geographically
You do not have anything to do with him
You do not sleep with him, nor cook for him, nor spend any time with him
You do not allow him to take your dc anywhere
If he threatens to physically manhandle them away, you call the police
When he turns up after drinking, in the car, you call the police
If he threatens to take you to court for access, you say go ahead and that you will disclose his drink driving to your GP, health visitor, social worker, his employers and the police
when he loses his temper, you call the police
you tell his family and your family he is a drink driver and you are no longer enabling it
shame him, shame, shame him...tell the world, stop absorbing his shame for him
I am sorry about the illness in your family, but that is no excuse
in fact, it is all the more reason that you remove your dc's from danger, fo good
I suspect I am going to regret engaging with you again, however