Welcome to the board !!
Great story as well, thanks. And, nice cards (love the Uzit). I say keep the collection & learn as much as you can about the cards, you will probably soon find the passion that your Grandfather had for them- and then there is no turning back
But, if for some reason the bug doesn't bite you, you can always sell on the BST, an auction house, or ebay.
Thanks again-
Sincerely, Clayton