All too familar to me. My mother was a hoarder. Hoarding is an is a obsesive compulsive mental disorder.
When we moved her out of her house because she could no or would not take care of herself, the filth and clutter was unimaginable. But all of us kids had at one time or another "cleaned" by hauling off stuff or calling in a dumpster to throw her junk into. But it was like a fungus, we would come back a few months later and it was if we had never been there.
Hoarding affects the whole family.