Originally Posted by
Lunakim 
I just asked him politely and he said he will not drink. Lets keep our fingers crossed!
Drinking is what alcoholics do. I would suggest keeping your expectations low.
Personally, I would expect to discover at some point during the weekend that he decided to drink. I would also expect to get some grief from the person since they will be unhappy remaining sober and will see it as my fault.
Finally, if my family judges me for my spouse's drinking then there are bigger issues at hand in that relationship. My spouse's drinking is no reflection on me unless I make it such.