I can definitely relate here... I wasn't DF/DA (couldn't be, as I was never 'dunked' - a small mercy), but my views of the WTS, when they were eventually known (after doing my best to keep them hidden, knowing the grief it would cause), led to my being shunned by my three sibs (my JW mother too, initially, though thankfully she came to her senses; the parental bond can overcome a lot, even religious brainwashing ).
It's a situation that continues today, a couple of years down the line, and I can only echo what others have said; as hard as it most definitely is (I still often vacillate between feelings of anger and grief for lost relationships from time to time), the best thing you can do for your own wellbeing is to emotionally distance yourself from the situation and concentrate on working towards building a post-WT life for yourself, while still 'keeping the door open' for your father, should he have a change of heart in the future (knowing the power of the WT, though, I wouldn't pin my hopes on it).
Very best wishes to you ((((((LyinEyes))))))
"They never told me what was the truth - just a young man losing his youth..."
- 'Bear Cage', The Stranglers