I had a pretty good heart to heart with a few single parents last week.

All really nice parents but kind of frustrated because although the group was mixed ages and so were the kids the time in their lives these parents decided to parent were more or less different quarters.
The First quarter parents started under twenty and had different needs than say the parents that started 20 to 40 or 40 to 60. The last quarter parents actually a couple by choice but many by family necessity and even that was a little different.

It got me to thinking back when Parents Without Partners was a thriving organization with chapters that met in all kinds of places. I don't know if the internet pretty much knocked them out or thety are still are around but their groups often naturally sub_divided for some events then comingled for others. It might be something to consider. One thing that did not help that much was trying the Mom's only or Dad's only because well it was not facilitating the cross gender cooperation.