WOW… 70 Children out of 151 Invites… that is a high percentage !!
First and foremost, from an Etiquette point of view let me assure you there is NOTHING WRONG with setting limits / parameters for your Guest List. You are the Hosts, so you get to decide (for sake of your sanity… try to be as consistent as possible)
Also, you cannot put NO KIDS on any of your paperwork or website.
The best you can do is to print … “Adult reception to follow” on the bottom of your Invites
You can then set your parameters as Adults & the children who participated in the Ceremony (Ring Bearer, Flower Girl, Pages, Jr Bridesmaids etc)
And an age cut off as well… no one under say 12, 14, 15, 16 or 18 are common choices.
Setting parameters by relationship is do-able but a lot more complicated (especially as there are so many kiddies in your family)
In that scenario you could go, Wedding Party Children, plus Nieces and Newphews… no cousins.
Honestly, with so many kiddies in your family I have to say that no matter what you choose to do, you are probably gonna run up against some Parents who are gonna disagree with your choice to have NO KIDS. My best advice, is to use the ” 2 Seats are being reserved in your honour “ format for the RSVP Reply Cards… and staying strong in your vision. Because if you are weak and open the door for one exception… you’ll have your back up against the wall before you know it… and the masses will come bursting thru !!
Hope this helps,
PS… Just so you know… if someone wants to bring their kiddies to the church ceremony… there is little you can do to control that… as churches are considered public venues open to all (that whole welcoming Christian aspect). So it is hard to enforce a NO KIDS Ceremony… for Receptions it is easier… just address your Invites appropriately (TO the Parents, no names of kids / no “and family”) and use the numbered RSVP Reply cards as I’ve outlined above. If you want to be really really generous, you could organize Babysitting services for the kiddies during the Reception portion of the evening… BUT at 70 kids, that could be quite an undertaking !!