Wow, a beautifully written tribute for your dad, and I think a very important piece of writing for yourself as well. Good for you.
My mom is 86 and still a JW. None of us kids are, most never were, and the two that were are now both DFed, which includes me. I've been taking this time to talk with all my siblings about how we should handle things when Mom passes away. She's hardly at death's door - she easily passes and acts like someone decades younger - but I know it will come.
For me, she's still in a Hall where I was a super-elder for many years, so I think it will be more difficult. I'm just trying to be prepared.
Your dad sounded like a good guy, and I'm glad you had some time with him in these last years.
S4