Hi R.,
You may wish to rethink that idea! With you having already to pay for 9 kids, adding 3 more is going to be tough. Are you sending invitations out? If so, just indicate on the invite that you are only inviting those friends, so they clearly know that if they bring thier siblings, they will be responsible for their other siblings. Another problem you will run into is paying for the parents. Are those 3 friends that your son wishes to invite, do you plan on paying for their meals as well? Do you want them to just drop them off (3 friends) and you will be responsible for them?
We looked into Gattitown too, but decided against it because their was not a package deal that they offered. You were just responsible for paying for each person who attended the party. Then you run into the trouble of paying for parents too. Most parents that come to b-day parties (especially of younger kids) plan to stay, so are you going to make them pay their way too? See the dilema? It is touchy and I wouldn't want to be in your position, thats for sure!!
You will definitely run into some money because purchasing 12 meals + your own will be expensive. Also, do you plan to give those kids a PLAYING CARD to have any fun after they eat? That is another expense as well.
Think long and hard about it, it could become a very awkward situation.
If I were faced w/this decision, this is what I would do. I would do only your family at Gattitown and then have your kids 3 friends maybe over for a sleepover (the following weekend), then you would only have to deal those 3 freinds, rather than siblings, parents and shelling out all of this $$. Do pizza, movies and popcorn w/his friends and then breakfast in the morning (donuts & milk) and then sent them home after breakfast the next day!!
Good Luck!
G. B.