I have a tricky situation and I don't know how to handle it.
My mom's friend, husband and 19 year old daughter were invited to my wedding. This is an adult only reception and only guests 21 and up can bring a guest. She never RSVP'd, so my mom called her and left a message.
She responded on facebook and said she and her daughter will be there, but her husband cannot come, so they are bringing the daughter's boyfriend in his place.
My mom doesn't understand why I'm upset about this. The boyfriend wasn't invited. I don't know him and, again, no other guests under 21 can bring a guest.
My mom said you can't say "no" because then none of them will come and it will ruin their friendship. Besides, she says, it's not like it's changing the total number of guests coming.
How do I handle this? I need a polite way to say that I would still like the two of them to come, but unfortunately, the boyfriend cannot. I know I already made her upset once when I had to politely tell her at a party we were at last year that her other daughter (whom I don't know well and is 13) would not be on the guest list.
Am I being irrational? I need some help.