Hoarder in-laws want us to inherit their stuff

pay a clearance company to do it. Spend 1 day having a quick look through things to see if there's anything you'd like to keep,

But it does seem a shame for your DH to have told his parents all their stuff is worth nothing! Yes it might not be worth any money, but he must want something from them. A few childhood christmas decorations? A few things to remind himself of his parents?

No its not very selfish at all.

They shouldn't live their life to suit you.

Presumably when they die you will inherit. For that, you will have to do some work.

Take the stuff out the house that you want. Then order some skips and hire some people to shovel all the stuff into them.

It's neither hard nor particularly expensive.

I suppose it is to an extent but they probably don't feel any differently about their stuff to 'normal' people who no-one would expect to spend their latter years selling off their belongings to save you a job. I appreciate they might have an excessive amount of stuff but they probably don't see it that way. I say this is someone who's in-laws live in a massive house with multiple outbuildings, all packed full of junk. Ultimately we will need to spend months and months throwing stuff away when they are dead. It is what it is.

Just start saving now for a house clearance company to empty the house when the time comes.
I doubt they’ll change their minds.

I wouldn't bother. Hoarders rarely have any insight into the condition, especially co-hoarders.

OP, if I were you I would just stop stressing. You will never change them. Just resign yourself to getting the house cleared once they've gone.

We've had to do this recently. 4 bedroom house , 2 lofts and a huge garage. If they won't clear it, set aside money to pay for skips or house clearance because it takes weeks to sort out. Be aware there's certain things you can't put in skips. Make friends with the local scrap metal person. It's brutal and took 3 of us around 6 weeks. If your in laws are adamant they won't clear it, they really won't !

Pay a house clearance firm. They are pretty ruthless and most will go in a skip, so the process doesn't take very long.

It is, yes, but hoarding is a mental illness. When the time comes, if you can’t face the task, there are companies you can call in to do it for you. I have an elderly hoarder mother so I do sympathise.

I would be very clear that you will be getting a clearance company in to get rid of the lot.