If it was his usual group of friends then I'd be fine asking them that and probably feel good knowing they would be watching his droning too.
He has a few really responsible mates who would be respectful, and then there's the other group who drink and party a lot and don't care about stuff who probably wouldn't listen if i asked to try not to drink much and now also these ones I haven't met.....
If I knew what they were like I'd feel better too.
DH & I
DD 2 years old
& DS due end of July 2013!