I wouldn't send an email if you don't know him. I would just send him a card now and then..perhaps with a few postcards addressed to your family if he has time (stamped) to respond. Or postcards of your town or whatever. If you have time and money, perhaps a little care package with whatever...sunscreen, hard candy, things like that. They like getting actual mail. If they still have mail call it is very important that they get mail. mg