How to let people know they can't bring uninvited guests?

I think putting their names on the RSVP cards is fine. You shouldn't put "and don't bring anyone else" but fine to put names.

I think what you are doing to enough. If they fill in extra names just call them and say that the venue has limited seating.

Thanks ladies. Do I come across as rude writing their names in the RSVP cards where it says M_______ ? will attend can't attend (that's how my RSVP cards are worded).

I personally wouldn't write it in but it's up to you.

I would prefer not to have to write it in and I wouldn't if it was just one couple but it's about 6 of them who believe that any wedding invite means their kids and their kids' spouses also. This would increase my number and cost. Not to mention they would literally just show up to the venue. I'd rather not invite them at all but apparently I can't do that. I'm trying to avoid having an extra 15 people at my wedding.

I had 1 person do this to me (yesterday as a matter of fact), RSVP 2 weeks after the deadline and added +Guest on his RSVP when the invitation was addressed to him only. When I text him who the name of the guest would be, he didn't know yet. I told him it was plated and I needed to know ASAP-I had no idea how to respond

People kill me, absolutely kill me. My grandmother would roll in her grave, and my mother, who is bed ridden will lose it if I tell her...

I know it can be annoying. I had a very small ceremony and personally handed my best friend the invite and her mom decided she wanted to go and invited my friends dad and 30 year old brother too

We had probably 3 couples do this.. all from the same family. It's annoying, but I just said fuck it and let them bring their 25 year old single step son whom FH and I have never met (yes, for real). I wanted to address it but FH told me to wait until all RSVPs were in. When all were in, we still had plenty of space so I just let it go. People are rude and sometimes it's without even realizing it. I think what you are doing is the extent of what I would do, and that's what I did. If it happens, and you can't let it go, contact them and let them know you're sorry but there is limited space

Ugh, i really hate this.....do they not understand everything that goes into planning something like this? Rude.

I did everything you had mentioned and for the most part it worked out well. But... I still had one person add another guest to their party of 4. The invitation was made out to the ______family. With all of the names in the family who were invited. I added that there were 4 seats reserved for them. A few days before the RSVP date was when we found out they decided to add a 5th person. Am I little annoyed? Not going to lie, of course I am. But I think my FMIL is more annoyed about it than I am because this is her friend.

I would put their names on the rsvp!

I would write it. That's what we are doing to avoid uninvited people.

Put their names, or just don't invite them at all..

Yes you should. As a matter of fact, I would call them once the RSVP'S come in to clarify.

I had one guest I knew was going to pull something similar to what you are concerned about - I did exactly as you are considering and wrote their names out on the card so they couldnt think it was ok to add any extras on. I think if you know they are prone to bringing extras who aren't welcome, it's fine to do that. And if for some reason those people still write in an extra name, just call them and tell them you are keeping to a very strict invite list and unfortunately there will be no space for JohnDoe.

All of your suggestions (writing their names in the RSVP card, addressing invitation to husband and wife only) are spot on. However, it seems as if this couple will do what they want regardless of all of your hints. If that's the case, and you know they're going to bring extra people, regardless of who the invitation is addressed, then either don't invite them or leave enough space in your guest list/budget for the extra people.

You can absolutely say to them "unfortunately we are at capacity for our venue and cannot accommodate any additional guests."

I don't see an issue with writing their name in.

If they try to write in anyone additional, just say what @FutureMrsCohen suggested!

Specifically list who is invited, but budget as if they'll ignore you. If they show up with extras, do you have a DOC to deal with it?

I"d also put their specific names on the RSVP. And be prepared to call them, keeping in mind that THEY are the rude people, not you.