Hello Humpty Dumpty: Well... the Skeezyks is an older person himself. Not as old as your grandfather... but older. I was an only child born into an elderly extended family. And I spent my whole youth going to one funeral after another as each of them passed away. So I have some sense of what you're feeling.
Of course death comes to us all sooner or later. And, since your grandfather is now in his 80's, it's inevitable that he will probably go within the next few years, if not as a result of this, then from something else. Please take care of yourself during this difficult time. I send many warm hugs your way with the hope that you will be able to find deep peace within...