One problem faced by any Keeper in the presence of family members is constant questioning and doubting.
"Do you really need this ?"
"Why don't you just throw it all away ?"
"None of it is worth it / worth anything"
"It's not worth the money you are paying for storage"
"There is much garbage, therefore it's all garbage" ( Contamination Principle )
"It's easy to clean up, just start discarding stuff" ( That the interlocutor deems discardable )
etc.
I'm sure the detractors are nodding in agreement to these.
Here's a better, healthier way to approach this ( largely hypothetical, as I know most family members will not be able to overcome their own mental model of the situation ).
Treating the Keeper as a person, their needs and intentions, and the underlying possessions ( whatever they are ) as first-class, legitimate, unquestionable things.
If an interlocutor assumes the legitimacy of these, they would not have grounds for constant questioning of the above kind, and everything could be approached with a constructive mindset.
The engine of oversimplification is powered by assumptions, simplifying and projecting assumptions.
If, on the other hand, the interlocutor jumps to conclusions, and throws in the notion that "the person is mentally ill, or, at best, of diminished competency here" - they will trivialize and delegitimize everything including the person and their needs, and it will be as usual.
Merely hypothetical, I know, as few family members in that position will be able to "stop and think" what really is going on.