So sorry to hear, Bryan. A father/son bond is one of the strongest there is I think. I almost lost my dad earlier this year with a sudden onset of health issues (UTI, septicemia, the flu, pneumonia and a fungal infection) all at one time. He somehow made it through at 96 (doctors called it miraculous for anyone, much less at his age) but hasn't been able to walk since and is now in a nursing home from how much it weakened his body.
He's in good spirits and really enjoys our visits. I've been considering this time I have now as "borrowed time" and thankful for the opportunity to spend a little more time with him. At 31, and knowing there's not much time left it's hard, but I couldn't have asked for a better father. It sounds like you were blessed with a great one too.