I am looking for a four-five star experience for our family at a dude ranch in Wyoming OR in Colorado.
It's not in Wyoming but you will find nothing better than Dunton Hot Springs this is by far the best ranch style stay I've ever had. And it's in the top ten of all my travels! Look it up and you will see why it's the best! The hole ghost town has been restored including the cowboy bar!
The C Lazy U Ranch in Granby, CO, is pretty cool. It really looks the way a ranch should look and they do cater to kids there. They have ponies for the little kids, scavenger hunts, races, games, hayrides, you name it. And you might like this -- they have counselors there to take care of kids.