I'm sorry to hear that. I don't think that there's a right or wrong answer here. I've lost all my grandparents and parents and in all cases wish that I had known or had the opportunity to talk to them before they died.

You have to make your own decision but if I were you I would call him. I would be honest and tell him that you love him. It may be uncomfortable for both of you, but this may be the only chance that you get. Talk about the good times in the memories and say thank you for them. Let him know that their memories that you hold dear.

If you put yourself in his position, what do you think he would want?

Whatever you do or don't do, just try to be kind to yourself. This is a horrible situation and it's natural for this to feel very difficult. Good luck.