Kath's and my kids are about the same age. Like her I put the kids out in the garden, although I use a walky-talky to communicate with them until I go out and join them. They go in a hammock and I go in a different one, last time was a week ago today and they loved it even though it stormed all night. In your garden you can carve, make cordage, fire drill, learn the stars, practice water purification, make fishing hooks etc etc There's loads of stuff for the suburban bushcrafter, you might need to prepare for some of it, collect some wood etc but it will be worth it. Another very useful thing would be to practice basic knots, learn how to sharpen and maintain your knife ....
Anyway, you get the point, we all do stuff in our gardens, no matter what size they are, those that don't have gardens do it in the living room and tidy up afterwards!!
As has been mentioned, the BushMoots would be a great place to come to learn more for both younger bushcrafters and their parents, it's a packed weekend that you can take what you want from, there's no pressure to do everything, you just take what you want and one of the greatest things about it is the people there that are willing to talk to you about any aspect of bushcraft. Everyone learns a great deal and it's an opportunity to learn specifics if you need them. Oh, and they're very cheap :super: