I love my aunt to death and she's been very good to me. However, I feel really awkward about a request she made: Can her 17 year old daughter bring a friend to the wedding? Usually I wouldn't care (and if I were 17 I'd want to bring a friend too!), but we have room for 150 guests maximum at our resort and we think that 130-150 are coming (100 have already booked rooms and flights and we haven't even sent out the invites). Plus, we didn't even give our groomsmen a "plus one" if they were single! Because they are family, this random girl would also have to be included at our intimate rehearsal and rehearsal dinner. Do I dare say no, or suck it up and say yes? What would you do?