What childhood experiences can causes a person to hoard?

[Inawayalso]

I’m just wondering as I know of 2 siblings. One of them hoards and only buys second hand or free the other throws everything and buys brand new, always the most expensive brands, never second hand.

The hoarder really struggles with anxiety at the thought of throwing anything. I’m just wondering what kind of upbringing could create a hoarder? Let’s say for arguments sake the hoarder is not ND. Could the parents have been non emotional?

There was a definite escalation in my father's hoarding when he lost his parents - not at a young age, they were in their 80s, but both died within a couple of months. That was 25 years ago, and my parents' garage is virtually inaccessible because it's full of the contents of my grandparents' house.

The rest of the house is crammed with his stuff - piles and piles of multiple-buys mixed in with actual rubbish, plus my father's collection filling an entire bedroom, most of the living room and piles here and there everywhere else. It's awful.

My sister and I are dreading the point when it will have to be cleared - we can't just get a house clearance because buried in the crap will be things of sentimental and actual value.

My sister is ruthless about throwing things away, but I have inherited the hoarding tendency and struggle although I am conscious of it and do try to keep it under control.

I also thought this person was neurodivergence but Im starting to think it’s attachment issues, they seem to mimic a lot ND traits. I thought similar of myself as I have attachment issues myself, I don’t get attached eg. Perhaps the mum and son also has attachment issues hence being attached to nothing.