Long illness, etc. He hadn't really been mentally present in more than a year, and to be honest nobody was particularly present in the most recent few months, although he did seem to think the 2 year old was mildly interesting. Dad and I said our goodbyes some years ago, and the family's been mourning for a long time now. We grieve over an extended period.
My dad taught me that the only things that matter are where you stand, where you point the lens, and when you "squarsh the masher."
He also taught me to assemble the whole thing first, and then tighten the bolts.
He tried to teach me, by example and to limited effect, to choose my words with great care.
He was a pretty smart dude. I miss him. Got a bunch of lenses and a couple nice cameras of his to remember him by.