So Spring edition 1942 is the easiest to learn. Depending how sophisticated your grand kids are you may or may not want to start them on that game.
If they are already too experienced for that one if you had AA50 I would recommend that one since the ruleset is the best and not as complicated as Global 1940, Europe 1940 or Pacific 1940. Since you have Revised that would be my recommendation for a more complex game.
@barnee thanks for the tip… Im going to be all over that! Has to be good practice for when I finally find a group around my area… As Im a total novice, and will probs slow the game down!
… So thanks for that, heading straight over there!