Mostly at that age they want to be included and spend time with you.
I like the dominos with Carcassonne idea but how would it work? Draw 6 tiles and try to place, and redraw if you can't? Carc is designed so that you can always place a tile. What rules did you use for "domino-carc"
Carcassonne using simple rules would also be fab. I don't think he could put meeples down to claim a building or a road. How have you adapted it?
(Roll through the ages isn't avaiable to me right now)