I need help with the etiquette regarding adding last minute plus 1's to our guest list. My bridesmaid (also my sister) was offered a plus 1 for our wedding and she had declined it several weeks ago. We had asked for everyone to rsvp by Oct 18 because we needed to turn in all of our guest info by Nov 4 and I knew that there would be some people who would forget to rsvp and that I might need time to track everyone down. She texted me on Nov 5 saying that she would now be bringing a plus one because he was able to take off work. I didn't even know she was dating anyone until that moment and she was trying to guilt trip me saying that she wanted to introduce him to the family. I understand that she is spending a lot of money to be a part of my wedding (flying in from out of state, dress costs, etc) but I feel that a deadline is a deadline and I didn't want to make an exception. She has also been very flaky about her plans from the get-go and it has been hard trying to schedule wedding/ bridal party events because of that. I would have been more open to the idea of the last minute addition had she let me know back several weeks ago that her potential plus one was trying to take off work, but she waited several weeks after the rsvp deadline and the day after all of my info was due to say something to me. My parents are now extremely upset with me and have called me a bridezilla for telling my sister/ bridesmaid no to her plus 1 and so to avoid any more fighting over this I caved, even though it is against what both me and my fiancé want. Am I wrong to think that if she is well past the deadline I provided and that she already declined a plus 1 invite that she shouldn't be allowed one now?