We are having an adults only ceremony and reception. Our adult requirements are ages 18 and over. Our save the date and wedding website indicated our requirement. Someone in my family suggested for a teenager to attend without checking with me first. I was just caught off guard when they mentioned that she was attending. I had a quick discussion with my family member that we are having an adults only ceremony and reception and that the only children allowed are those who are part of the wedding party (ring bearer, flower girls, jr. hostess, and jr. ushers). She then suggested for the teenager to be added to my wedding party as a jr. hostess. I told her that I would discuss with my fiance because I don't think it's fair for me to make an exception for this one but can't make an exception for others. How should I proceed with this situation.... Please help with providing your thoughts and suggestions.