My grandparents are long dead. But I feel I didn't see them often enough when they were alive. By the same token, I never felt I had a special place in their hearts. For example, I don't remember them ever holding me as a child.
None of mine are alive anymore - the joys of having super old parents - so I haven't seen them in seventeen years. When they were around, we saw them every weekend. Trying to start the tradition with my own kids and their grandparents, but we're busier than my parents were (or at least it feels that way).
I saw my grandmother last week. My grandfather I haven't seen for a couple of weeks. He left the country for a holiday. I try to make time for my gran. My grandfather on the other hand, I haven't visited in close to eight years because of a family dispute, which is quite sad really. I sent him a Christmas card last year, which was a start.