Cleaning up after your parents is a gift you give to them: look at it like them paying it forward for all the times the cleaned up after you as a child. Psychologically, mentally, and physically, parents can have difficulty tidying up their stuff. My friend’s parents came from very poor backgrounds and had a lot of trash. The father had a shed full of stuff that was useful to him - he knew what was in it and how to u…
What are some examples of the obsolete tools? I can imagine a manual hand drill...
Whitworth wrenches, sockets, taps, and dies. My dad had a British motorcycle shop around 1980 and I'm pretty sure there is still some of this in his tool boxes in the garage.
Homemade jigs whose purpose you can't even figure out.
I think the dominant category would just be extra or broken or cheap tools that aren't worth hanging on to. For some reason I have like four stubby Phillips #1 screwdrivers. Cheap hatchets with broken handles. Mushroomed lead mallets. A whole drawer of dull drill bits.