Kinda hard to summarize in a thread title, but here's an example:

It's a third person shooter, but instead of being soldiers in a war, the players are kids pretending to be soldiers in a war. So you're running around pointing with your finger or holding an imaginary bazooka or whatever and when you push fire, your kid yells BANG and the other player is out.

And maybe have some special rules that make it more authentic, like if you go out in the street you get put in time out for a while or whatever, lol.

But you could do this with all kinds of stuff. An RPG where you have fake swords and pretend fire spells and such, and you "fight" a "monster" (tree) to rescue the "princess" (teddy bear), for example.

I dunno, just sounds fun and cute. I think it's important that you stay out of the kids' heads. So no realistic sound effects or explosions or whatever.