I’ve known several people who had to go through their parent’s entire lifetime of accumulated stuff and it was quite the job. Dumpsters were rented. It was a big burden to leave the kids.
Digital stuff will also be a lot to go through. My dad has hundreds of thousands of photos, backed up in triplicate. I was helping him clean the basement once and found 5 1/4 inch floppy disks labeled “backup” from the 80s. He’s kept all digital files. Many of them are locked into various proprietary apps as well. So I’ll likely need to spend months going through it all, while everything is still working, to see what is worth saving, and migrating it into a format I can manage. It will be a massive project, on top of the physical stuff. I’m hoping I can talk the rest of the family into an estate sale for the physical stuff, but the digital stuff is arguably the bigger job, with no way to outsource it.
There is also the question of corruption, or simply being able to read older files. I grabbed some documents I had saved on his computer back in high school about 15 years later. I had saved them as rtf files at the time so they would be more portable. I tried off and on for a week or two to read them in more modern times and it was a no-go. I could get sections, but not the whole thing. I don’t know if the rtf standard changed or the files were simply corrupt, but they were basically trash. I’m sure I’ll run into a lot of that as well.