Having looked up Hoarding Disorder on the NHS website,, I've talked to the relative - and also their partner - who visited X (the hoarder), and who is in some ways the person the hoarder is closest to. The response was mainly from partner.
My family member who visited tends to be rather avoidant/minimising. Partner said, to me 'Oh well X has been planning to have a kitchen designer in, in which case they'll obviously have a clear out.
But X has been talking about having a kitchen designer in for around 10 years, so am not v convinced by this.
The situation as I understand it is X was reluctant and evasive when they said they wanted to visit and made it very clear they couldn't stay overnight because their house was 'not set up for visitors' X had suggested meeting instead at a nearby venue.
My relative pushed it a bit because X's Mum had been going on. 'Why don't you visit X? X keeps telling me they keep inviting you and you never go round. You've really hurt X's feelings.'
Which was a bit odd. Because either X or X's Mum wasn't being entirely truthful.
Anyway it was agreed they'd have lunch at X's place. On arrival they were told they could not go upstairs and were only to use the downstairs loo. The description I was given that downstairs stuff was piled everywhere including on chairs, sofas, table tops, work surfaces. And rather weirdly, though a basic lunch was provided, X could only produce one plate to eat from. (I think after a search some paper plates were unearthed..)
My guess is that X may be struggling in a variety of ways. Working remotely and doesn't like job. Had a bad time during lockdown. A relationship - the only one I know of their having - came to an end a few years before that.
Last time I saw X they were looking a bit unkempt. Not really really dreadful but a bit scruffy and uncared for. Wearing the sort of clothes you'd put on to do some dirty job, but in fact he was out and about.
I think I am the only one in the family who would be upfront enough to talk to X and feel I ought to try and do this.