Post # 1
This post is going to be more of a vent than anything else, but here goes:
When my FH and I got engaged we knew immediately who our Maid/Matron of Honor and best man was going to be: my sister, and her boyfriend/his best friend who introduced us. It was going to be perfect.
Except now my sister and the Boyfriend or Best Friend… well… let’s just say that it ended pretty badly. They’ve been on again/off again, but I think this might be for real. Sister had said she’s willing to be civil at the wedding, and I don’t see Boyfriend or Best Friend causing drama… but all of us travel in the same circle of friends, some of whom I’m not sure I can trust with this type of drama. Some asshole thought it would be funny to tell Boyfriend or Best Friend that my sister cheated on him with one of his/our male friends… not why they broke up, but somewhat related.
Argh I’m upset about this. I don’t want drama at my wedding…
Post # 3
I just wouldn’t invite the friends. They seem to be the problem. Personally I wouldn’t trust them to start drama if it didn’t even involve your sis and her ex.
Post # 4
If this guy is still your FI’s best friend, then he should still be best man, and of course your sister should still be Maid/Matron of Honor. Both he and your sister sound like they will behave for the wedding, so that’s all fine. They don’t really need to interact at all, often the extent of one-to-one interaction is walking arm in arm up the aisle for 60 seconds at the end of the wedding.
Remember lots of weddings deal with people have had a nasty split: those with divorced parents. If divorced parents can behave (and usually they do), then so can a couple who didn’t get as far as marrying and having kids in the first place.
But I agree with @greymonkey42: , you might want reconsider associating with immature friends who like to cause trouble.
Post # 5
@paula1248: sensible advice..