Yes it was hard with the father in law as it was sudden. Mother in law had dementia for 7yrs, that was unpleasant to watch. Dad had cancer but we knew that and were prepared, mum we thought she would have been the first to go actually went last.My partners mum past away last year at 67. First death I've really experienced in that generation.
I distinctly remember her dad saying "we had all these plans".
They were quite well Off and it came out of the blue. Ie no time to make most of what's left.