My fiancé and I recently got engaged and we are planning a relatively short engagement and intend to get married at the end of August. We decided on a small, low-key destination wedding with family and a few close friends. We chose a date and a venue and sent a couple texts to family members to let them know the plan with the idea that formal invitations would follow for people to rsvp. We received a text back from my fiancés sister letting us know that she would be there with a guest. We hadn’t even considered plus ones because we were pretty set on a more intimate ceremony with only those closest to us in attendance. On top of that, she and her husband (also one of my fiancés closest friends) separated in January and she immediately moved out of state and we haven’t seen her since then. Her (ex)husband is also invited and we previously spoke with them both about it knowing it’s a sensitive situation so that there would not be any surprises.
So, I am completely unsure how to handle the situation. Do we let it go and allow her to bring a plus one or tell her that we would prefer she doesn’t bring someone? We have never met this person and didn’t even know she was seeing someone until today. We wouldn’t be meeting him prior to our wedding and I’m just not sure that it’s the time or place for her to introduce someone given it’s a small, destination wedding.