My heartfelt condolances....the bond between a Son and his Father is a bond that doesn't end in death, he'll be in your heart and on your mind for the rest of your life.
I lost my Dad back in July, he died at 88 from complications with Alzheimers. I think he overheard that he was going to be admitted to a LTC facility and decided that wasn't going to happen :)
All we can do now is to live our lives in a manner that would have made them proud to call us their sons.