Well, I survived, and it went better than I could've thought. Apparently he didn't want to upset any apple carts in my life either, and it wasn't til he ran into my mother at a high school reunion on the weekend that things got cleared up.
When I met him at the restaurant, he recognised me right away, and went for a hug, then stopped for a sec to ask if that was okay with me- and it was. No tears, very little awkwardness, but lots of questions on both sides. Both he and his wife seem very warm and friendly people. They've invited me out to their cottage while they're in Newfoundland and that if I ever want to visit them at home, they'd be happy to see me there too.
According to he and his wife, I have a whole big extended family in Alberta who'd welcome me with open arms, though they're not sure how their youngest daughter will react to the news. I sort of got the impression she's in that surly teen phase, and might be at a loss as to what to say to me. I'm half thinking of writing her a quick note, to tell her I'm at just as much of a loss, but that " hi" seems like a good place to start, but I'm not sure that's a good idea. . .
I'll probably travel up there, if only to make up for lost time with my grandmother, as she's 86, and who knows how much time I'll have left. Her husband passed away before I knew he was any relation of mine, and I figure grandparents are too rare to be so casual about now.
Thanks for the moral support, and advice. I think it's going to be mostly okay from here.