My fiance and I are hosting a small engagement party at the end of the month that we intended for close family and friends. We also intended to make the party adults only as that is the tone we want for the party.
That said, we recently received an RSVP card back from my fiance's cousin and her husband with 4 marked next to the number of guests to attend. They have two kids. While they are well-behaved and we always intended to include them at the actual wedding. We did not want them to be at the engagement party, which is why their names weren't listed on the invite.
My fiance and I are in a disagreement about how to handle it. He doesn't think it's a huge deal if they come, and I think it is rude. I also think that it may prompt other guests with children to question why they couldn't bring theirs.
Any advice on how to handle the situation would be welcomed!