A couple of weeks ago I posted about FI's cousin adding a plus one (her son's girlfriend) to the RSVP. Well after much debate we decided to contact her and let her know that we only planned for 4 people in the party and that we didn't have space for additional guests. I was very polite about it because it's the truth.
Well she said she understood and that her kids won't want to come without the girlfriend so to mark them off the guest list. This bothered me but whatever. Then FMIL called FI saying that the she heard through the family grapevine that the cousin was really mad because her son and the girlfriend have been dating for 5 years. Well, we didn't know that because we don't know this family at all. She could have asked ahead of time if she can come or explained that when we contacted them about the plus one in the first place. So now we look like the bad guys to FI's family.
So I don't know what to do...I don't want my new family to hate me! FMIL is upset because there already is going to be a lot of people on their side of the family that won't be at the wedding so she doesn't want less people to come.
Should we contact the cousin and explain that it was a misunderstanding and we didn't know they are in a serious relationship and that she can come? Or should I stick our original decision and leave it alone?