I like cooperative tabletop games.
Check out your local game store. See what they recomend for cooperative games with simple rules for beginners. Pick up one or two that seem interesting to you.

For the whole seperation thing, try going to the game store on your own. Come up with some options, then talk to mom about what seems interesting. Then go again on your own and buy whatever you agreed to try.

That way jist getting the games could serve both helping with separation and bonding at the same time.