I had something similar happen
As a child i lived with my grandad (there is a massive age gap between my father and his 3 siblings so to say they where not close is an understatement-i probably met them about 4 times in my childhood)
My narcissist mother didnt want me around and enabler father just went along with it so I was dumped off onto my darling grandad as his carer
When I was about 13,he started to get confused and it was dementia (id never heard the word before)
He was whipped into a home before you could blink
I didnt know any of this-as far as I understood he was just getting older and it was only a bit of confusion-id been his carer since I was a bit older a toddler so I could deal with that
My father's sister (as the only female) took the lead in arranging everything (but didnt tell anyone she was doing it) and part of this was to clear out his house
I came home from school to find she'd taken every single thing I owned and shoved it in a skip
School books,school uniform,my childhood toys,books,clothes,toothbrush,shampoo,san-pro-you name it,she skipped it and got very angry when I showed up expecting to come in and start our normal routine
She even refused to tell me where he was (she showed up to the nursing home twice in the 18 months he was in there-20 minutes in total)
Thankfully my friends mother was the head manager at the home and got a message to me via her at school
I had to walk back to my parents house and tell them I was staying there as grandad wasn't at home anymore-i remember the look of horror on my mothers face
What made it worse was my mother refused to replace some of what id lost (school books/uniform etc and i kept getting into trouble for not having them and school didnt believe 'all my stuff was chucked in a tip') and I had to work as a babysitter after school to earn the money to replace everything (she could afford it,she was just tight)
I had the clothes I was standing up in,my school bag,hairbrush and a few pairs of pants to my name
I had the last (ish) laugh-about 7 years ago,I finally signed up for eBay and I bought every single toy i could find-they live in my spare room (and ill never stop looking for a few other bits)