Hi Ragamuffin
It's really commendable you want to help your Uncle...but who's going to help you if you get sucked back into the maelstrom?
This sounds harsh, but believe me it's not...if your uncle wants to get sober there's any number of programmes and any number of people with more sober time than you who would be glad to help him....right now.
If he doesn't want to be sober, then theres nothing you can do and you're really not doing yourself any favours by having him in your house right now.
Can you drive him home or something? he can always pick his car up later.
D