I too know what you're going through. I was Df'd around 12 years ago now and my dad, who is an elder, has very little (if any) contact with me. Having been brought up as Witness I knew what to expect from my dad, and still recall his parting words the last time we properly spoke "You do realise that we won't be able to speak from now on? Not unless something serios happens to either one of us". Fine words to leave your eldest son on eh?
Saying that, it never rankled with me as I knew how it would be, I just carried on as normal and lived my life without the constraints of having to live up to someone organisations exacting standards. I'm all the happier for it, and I think that it's my dads loss rather than mine. He has to go through his life knowing that it is HIM who isn't speaking to ME, and he has to explain that on a regualr basis to my non-believing family members. Many an uncomfortable conversation he has had with them I can tell you! ;-)