Great tree house story... the part about the parents in cahoots with each other to keep the kids in line took me back to Glacier Hills.
We were a unique "development."
The original owners literally built their own houses... some more skilled than others. My dad did everything on ours except the plumbing and heating systems. I was 2-1/2 when we moved in... I helped with the redwood paneling that was in the original living room. It had a cathedral ceiling so the boards had to be cut at an angle. My job was to hold the boards steady while my dad sawed and keep my mouth shut.
The neighbors helped each other with construction... I remember the great basement pouring parties. They were done over two weekends... had to lay every other section. The men did the cement measuring and pouring... the women made lunch... the kids were an inherent nuisance. Pioneer America barn raising... 50s style.
The parents in the neighborhood were united in their philosophy of child raising. No nonsense was allowed.
If you misbehaved at someone's house, your parents knew about it by the time you got home. They were waiting for you. You were dead meat.
No one swore. So when you got the famous Glacier Hills parental line... "What the hell's the matter with you?" you knew you were in for it big time.
Because the neighborhood was run like this we had what we thought was incredible unsupervised free time... i.e. we spent a lot of time playing, inventing, creating without obvious overseers. Our folks instilled a finite sense of right and wrong in us... the vast majority of my peers adhered to it.
I am still in touch with the girls I met when we were 2-1/2 (before any of my siblings landed on the planet) as well as the kids I met at the advanced ages of 4 and 5.
We were not rich financially but phenomenally wealthy in humanity. I am grateful to have lived there.