I have hoarder leanings, but I have LEARNT to become fairly ruthless. TBH I DO think it's genetic in my case. My Great-nan and Great-grandad were terrible - My G-GD lost a leg in the war. Every time he got a new prosthetic leg, the old one was added to the pile in the corner of the living room.
. When they died, there was a stack of 50 years worth of daily newspapers FILLING the spare room.
My Grandad's house is a lovely 4-bed. Or would be if you could MOVE in the house (quite literally). My DC went to see him this week, and they had to have a meal in his field because the house is practically uninhabitable (think faberge-type eggs in the bathtub!). My DS1 reckons the kitchen is about 50% smaller than last year. I mean you REALLY can't get into the house, it'd be a health hazard if he had any neighbours. He is in his mid-seventies, and still goes to auctions every day. His friends are trying to help him clear the house, but he's still buying from the auctions at a quicker rate than they can sell the bleeding stuff.
My mum is no better, she has teachests full of stuff from when I and my db were little, her study is FULL of craft stuff that she can't even get into to use, and she's still buying more. She has a shopping channel addiction too. She cleaned her tins cupboard out last week, and found tins of soup that went out of date in 2002(!).
I AM a bit of a hoarder, but only sentimental stuff, and have spent the last 3 months 'culling' everything else. I now have 2-3 underbed plastic boxes for 'memory stuff' for myself and the dc in the loft. I can't bear to part with birthday, christmas or new baby cards though! I think part of mine stems from the family history, and it being seen as 'normal' in my family, but also because when my dad died when I was 10yo, I wasd living with him. I was sent to my mums in the clothes I stood up in. I wasn't allowed to have any of my toys (my S-mum sold the lot, even my huge Hornby train set), OR any of my dad's belongings, which she gave to my stepsisters, who promptly TRASHED everything my dad had ever owned that would have helped me to remember him.
. It takes a lot of work for me, and I agree with the poster who spoke of the photos - helps me too!