Hey, man, I'm totally sorry about your circumstance. That sucks.
As many here know, I totally lucked out in that my parents don't shun me. When I got DF'd last year, both Mom and Dad told me that they love me and this wouldn't change anything. I know for a fact that my Dad would hang himself on a cross to save my soul if he had to.
I honestly don't know who to feel more sorry for, Ded. You, or your Dad. I have a very difficult time believing, knowing you as I do, that your Dad really _wants_ to be treating you in this manner. The conundrum he is facing must be very difficult to deal with.
The way I'd approach the situation is to flat out tell your Dad, Look, I'm your son, I will always be your son, I love you, you love me, this is the way it is, this is the way it's going to be, I need you, you need me, please accept it, and let's be a family.