Yes it does matter Bluestar, the analysis determines the strategy.
And detachment isn't a solution for living with an alcoholic for goodness sakes..
But you are right, an intervention with his kids is called for Pass.. if you think they will support YOU... you don't want them turning you during that meeting... I suggest you take the kids to your in laws and have everyone sit and have a family meeting about your H and takl it out
Do NOT tell H about it... Just invite them along and you sit back, let your in laws talk to the kids...
You be in the room, but let the in laws give them the scoop.. this will take the attack off of you...
If there's no taxi then I agree with earlier post - someone needs to learn to drive