I'm relatively new, but I'll say that four in the CD22 can get a bit tight. My kids are 7 and 3. You can make it work, which I intend to do, but you need to establish some protocols. We're still figuring these out, but here's a start:
One adult and all kids evacuate for meal preparation. Get 'em the heck out! Playing on the dock is fine, but you can't have four people trying to move through the boat while one is preparing food. At anchor, this would be a good time for the kids to play in the dinghy.
Ditto for mealtime cleanup. You just cannot get it done with a boat crammed full. Leave the oldest kid aboard to dry dishes, maybe
There also needs to be a half hour to prepare the space for sleeping, and another to change it back to daytime/underway mode. Get the kids out for that, too.
These were the real bottleneck/headaches we experienced at the Lopez gathering, but that's been our ONLY overnight with all four aboard. If I'm out with one child, the boat's just perfect.
I'm about to try it with two children and no other adult. Pray for me.