When my parents kick off, I'm just gonna set fire to their house. Dealing with the arson investigators will be easier than going through everything Dad has kept since (my hand to God) junior high.
My family is a stratifying group. When we have something that needs to go into the attic, we go up the ladder, push the pre-existing attic stuff back until we have a space just big enough for the new attic stuff, shove it in, shimmy down the ladder, and shut the trap door.
All of the kids tease about "arson" investigations when she dies also. She is now thinking of moving, but none of the houses that she looks at "are big enough" for all of her stuff.
She loves clutter. Two years ago, my two sisters-in laws decided to surprise her for her birthday by organizing her kitchen (she had complaining about it for years). We all chipped in and bought lots of organizational bins, etc. I was gone the weekend they organized (boy am I glad now), but when she got home, she never even Thanked them, in fact she still complains about it, two years later, when she can't find something in her kitchen. Within a week, everything was back where it was originally.