I don't know how folks did it elsewhere, or what the rules was.

Here, a friend and I created ourselves a "bubble". My family and his family hanged out with each other. My kid was playing with his kid. We went on long forest walks, with the kids, and they could roam and play.

We didn't have contacts with lots of others, and if we did, we stayed away from each other for ~4 days or so, until we shared the same social bubble again.

Worked wonderfully well.