Hey Anabeo,
You can learn chess through many sites on the internet. A good place to start would be to learn the rules. Your son already covered that, so you're one step ahead already!
You can learn more by practicing puzzles and tactics, but mostly by playing other players. You improve when you lose to other players, so don't get upset by that. You'll improve your game by playing stronger players - it makes you think critically.
You can visit
http://www.chesscademy.com/ to learn more about chess and improve your game. It has much content about openings, endgames, middlegames, etc.
You can also look up YouTube channels. One is
http://www.youtube.com/user/thechesswebsiteYou can also visit
www.chesstempo.com for puzzles and tactics.
Of course, you can always practice on lichess using lichess' training feature:
http://en.lichess.org/trainingGood luck, and keep playing chess.
:)
CA