Invite Question--please help!

Ok, my friend who does invites for a living is making mine. I already posted a while ago about how FH's family is HUGEEE (his mom is 1 of 15 kids and dad is 1 of 10) so I am a bit nervous about an out of control guestlist. We have decided that on his side of the family, we will be able to invite all of the aunts & uncles, and only very few close cousins (his grandma on his mom's side has 67 grandkids---so this is insane!) We are also not inviting any kids--except for the kids in our BP and two families who are coming from Ireland, who obvs cannot leave their kids and go off to a diff country.

In his family, putting Mr & Mrs. Blahblah on the inner envelope means nothing. People still RSVP with kids even though their invite might not say 'Mr. & Mrs. Blahblah & family'. This happened with both of FSIL's weddings. So I need something that will reinforce my need for a strict guestlist. FH and my mom do not want 'Adult Reception' on the invites. So here is my dilemma with invitation wording. Which do you think is better for the response card:

1) 'Two seats have been reserved for __Mr & Mrs. Blahblah_' and then have them check off 'graciously accepts' or 'declines'

OR

2) Put '# of adults' instead of 'graciously accepts'
and then have a spot to check off if they decline

OR

any suggestions would be welcome!

TIA girls!!

I have the same problem with my side of the family. So to not have any misunderstanding I have on the first line of the RSVP:

_ of _ , which means, I have reserved _ of 2 seats.

That way they can't say they did not see it because they would have to changed it to add on. I am so looking forward to telling people off.

I would DEF do personalized response cards!

I am getting them too bc Fh's family is HUGE and we are having an adult only reception

My card reads..

Mr. & Mrs. Bob Smith

2 seats have been reserved for you

__accepts with pleasure
__ denies with regret


This way it would take a VERY BOLD person to actually cross off the pre printed number and write in a new one.

what about this:

M_____________________________
We have reserved ____seats in your honor
__Accept with pleasure (___of___ guests attending)
___Decline with regret