Yeah, had me thinking a bit how to reply.That situation makes for some tough calls .especially if your hoarder like a lot of us or very sentimental.like some of us
If I don't want something, then with dad's blessing I've had friends take a lot of the electronics equipment he'll never use - I think we both find that the antidode to hoarding is something going to a loving home. Plus hoarding brings stress if it just makes your house more of a mess and you struggle to clean it already.
Otherwise important stuff to them - dad's amateur radio, mum's clothes go into storage while they're around. They may never need it all again, but I feel better retaining it for them.
And then a house clearance firm can fill their boots with 70's furniture and their skips with the rest.
I don't think I'm hugely sentimental. The odd clock or ornament is nice as a reminder of days gone by, photos definitely. If something had a tale to go with is (usually involving guvvy jobs at the shipyards to make it) then I'll try to find a place for it. I think I'm lucky enough to remember childhood in a lot of clarity, so objects don't help a huge deal.