So my fiancé wants to allow his 14 year-old sister to bring two of her friends (that likely neither of us have ever met) to our rather small wedding to keep her company. I told him that I didn't really like the idea, and we decided she would be treated as every other single guest - given a +1.
It seems he had a conversation with his mother and since she didn't see it as an issue, the plan is that his sister is indeed bringing two friends now, even though I wasn't informed.
What should I do?