Alcohol at the wedding-when you don't really want it there

Hey everyone. So we are having alcohol at the wedding, and I would prefer it not be there but I got alot of backlash when I said that. A lot of people in our families have addiction issues or act crazy when they are drinking. Whats a good amount of beer and wine to have, so people don't get crazy but can still have a drink or 2? We have to order it ourselves. There will be about 40 adults or so. Thank you!