I just made a ressie for BOG for dinner and I'm second guessing it. My 13 year old twins will love the atmosphere, but not so much the menu. Is there any chance they will be allowed to order the kids Mac n cheese?
Disney is pretty good about picky eaters.
I myself as an adult have ordered mac n cheese at a restaurant before that had nothing on the adult menu I wanted.
But in your situation my thought is why not opt for a different meal at BOG if the dinner menu does not sound appealing?
The only perk to eating dinner there vs breakfast or lunch is the chance to meet Beast. If that is not a must for your family then breakfast or lunch could be a better option if the menu items are better.
I'm 23 and I've order kids meals before (because my appetite is tiny) only at quick services but nothing has ever been said to me. I think Disney are pretty accommodating with that.
We went for BOG lunch and my daughter who was 12 or 13 at the time only wanted something from the kids menu so I had preordered that. When we checked in the cast member without us asking called the chef and got her an adult sized portion of the kids meal which made her very happy. She said they can't always do it but try to accommodate. We were on the dining plan so that upped the value of the meal for us.