I think if you invite parents of children, you should expect the family to come to the wedding, I mean...really...why would you just invite the adults? I think weddings are a FAMILY event. I would never have a wedding and expect my guests not to bring their children, it is a family celebration..
I think if you invite the parents of children you should expect the individuals listed on the invitation to come to the wedding. Otherwise you have rude selfish friends who are more invested in thier definition of what a wedding ought to be than they are in participating in your celebration. In the kids are invited, great. If not, suck it up and get a sitter or decline.
The problem lies in these weddings with over 200 guests. That is your problem for having such an enormous wedding for sake of gifts and money, not for the sake of celebration of love and family. If you don't know them well enough to have their children present, then you must not know them enough to really care deeply on a personal level that they are at your wedding. (They meaning parents.)..
What?! That's a lot of judgement. So if FIL insists on inviting his long time co-workers that I barely know I'm having a wedding for the gifts and money? Damn, why am I paying so much for it then? Look, lots of people have big weddings for thier own reasons, which likely have nothing to do with wanting gifts. That may have nothing to do with why they don't want a bunch of little kids running around.
When you put such tight restrictions on guests, you run the risk (especially parents) of having them choose between their children and getting babysitter which BTW...in this economy...how can people afford? (Just taking that perspective since that has been thrown out there for wedding sake) and not having the guest come to your wedding...
Ok, so what? If you can't afford a sitter, decline. Affording a sitter is NOT the most expensive part of attending a wedding. Holy smokes, we're going to a wedding this weekend and THANK GOD the kids aren't invited! Yay! Adult conversation, dancing, a nice dinner, a couple of grown up beverages. Sounds like heaven to me.
In my family weddings are family events. Most involve a lot of travel since my family is very scattered, so naturally the children are invited to the wedding since we've all come from out of state. I have always loved that. When we got married, I invited the children of all my first cousins. They had a blast, I had a mini buffet of pizza, chicken nuggets, fries and shirley temples, a kid table with coloring books, crayons, matchbox cars, etc. The kids had a great time. I had the DJ play songs from Shrek for them. It was fun. But that was what I wanted and I got married in a smallish city where things are cheap.
Now that I have two kids of my own, I would never dream of imposing my children on someone else's wedding if they wanted an adults only event. Its not up to me to decide what weddings are about. We already decided what our wedding was about- I'll let the bridal couple decide what theirs is about, thank you very much.