I lost all my grandparents and an uncle, my parents are still here. It's one of the hardest things to contemplate, aside your own mortality, and I don't know how I'll react.
I rarely visit, if at all, the graves of the two grandparents that are buried where I live - it doesn't really have much to do with me not being a religious fellow, it's just that... it happened, nothing will bring them back, I just have to move on. Remembering is one thing, facing continously the loss is another, the less I think about it, which does not mean forgetting, the healthier it is.
I mean, I'll never forget my uncle, the father of my cousin that is basically a sister since we've always been so close, but there's only so many times I can rethink about the whole ordeal: the diagnosis, the first operation, things seeming to get better, the second operation, being told he had two months to live... it's a "defeat", life inflicted us a defeat and I don't want to spend too much time thinking about that, which, as I said, does not mean forgetting...
An aside - I also find weird our approach to death, and how funerals are sorry, desolate affairs. We in the western world live in a society where the most widespread religion preaches of a life after death, and yer funerals are gloomy and doomy and full of people crying. I don't expect people to rejoice at someone's death, but maybe take a lesson from those cultures where funerals are basically parties and everyone is eating or whatever.....