well when people get old they do go a bit grumpy and contancerous. but you jsut have to try and get on with him, try and make the most of it if you can while he is still about, sorry to link it to death, but i know recently i have become distant from my grandad and he is slowly getting worse and more frail, and i haven't had the chance to see him, so i am going to try as much as possible to go and see him before its too late.. but its worth a try, he does love you but may have a funny way of showing it, you are his grand daughter after all and he should love you, but do what ever you feel right in doing