@Brillig yes that's pretty normal.
For years after my FiL died, I would find myself thinking,
"Must go and see him, for some reason we haven't gone to visit in a while"
and now, more than a year after losing Mum, I'm making jam for the first time ever, her wooden spoons sat in the kitchen in front of me and wondering what she'll tell me about it when I call (she was a fantastic cook).
For both of them I was there holding their hand when they died, organized the funeral, scattered the ashes/planted up the grave, really, I do know they're dead! but part of me clearly is just extremely slow on the uptake.
@DazedandConfused27 I like to think of people going back to Nature and becoming flowers, beetles, our molecules becoming all sorts of exciting new living beings. And also, that I'm half my Mum, half my Dad so in that very real sense part of them will always be with me.
I also liked Terry Pratchett's picture of Death as some otherworldly chauffeur picking people up for the afterlife - even though I'm pretty darn sure that's fiction, I found the thought comforting anyway.