When we did our guest list I asked FI if, in addition to his best friend, he wanted to invited the BFs sister, her DH, and his parents, all of whom live here in the area. FI said no. Yesterday was our RSVP deadline. A bunch of people FI invited declined, unexpectedly. FI was just on the pone with his best friend and totally out of the blue told him "hey we're going to have room now. Why don't you tell your sister her DH and your parents they can come."

I like these people enough that I suggested putting them on the guest list in the first place so I would love to see them. But I also like them enough that I would rather not invite them at this point than throw them a verbal B-list bone three weeks before the wedding. And they aren't just a couple of random, single buddies who wouldn't know better and wouldn't care. These folks will know they got B listed. This one is SO not on me, Mr.!! Except that it is by association and I'm pretty much mortified.
Anything I can/should do other than this?

ETA: I guess the good news is, if you recall my post on chit chat about a week ago about the BF's psycho girlfriend preventing him from coming to the wedding ... well they broke up so now he is coming after all. So yay for that part.