Jim, my heart goes out to you. I lost my dad almost a decade ago after a protracted illness, and I still miss him.
But you know what? He passed it on, as he should have done. And now it's my turn. It's different being a dad when you're the "old man" in your immediate family, when there's no grandfather left. It's easier to accept your inevitable aging and maturing, and it's also easier to appreciate, and therefore nurture and guide, the beauty and endless potential that resides in youth, which is what a parent should be doing. You're not young any more, they are, and believe me, that is so much...clearer and easier to grasp once you're no longer "somebody's kid".
It hurts, I know. And like I said, you never stop feeling the loss (at least I haven't yet). But this is life, and as live is prone to do, when it takes something from you, it gives you the opportunity to get something else.
So here's to the life of somebody who appears to have been a great father, and here's also to somebody who will now no doubt pick up that torch and run with it like a champion.