First of all, your sons love you, no matter how they act or how ignorant they act like they think you are.
As sons, we feel obligated to try not to make the mistakes that our fathers did. We always think that we can do it better somehow. As time goes by though, we learn that life has it's little ways of interfering in our best plans. So, I want all of you with sons to know, we love our fathers more than we will probably ever express and most of us will end up wishing we had said more. We try to be the man we saw when we were young, we don't express how much we care because that wouldn't be "tough". It takes some of us a LONG time to realize that the really hard thing is to open up enough to say the things that mean so much. So, to all of you Dads, Daddies, Fathers, and Papas: We love you and want you around more than you will EVER know.
To the sons...
MAKE the time for your dad, he'll be gone before you know it and the hole he leaves in your life will be huge beyond your ability to understand until it happens.