I have experience with that type of "hoarder". It was an Aunt by marriage. Poor lady lived in her car as that was the only place to sit down. The bathtub was filled with National Geographics. Her two daughters came and hauled bag after bag out of the house. They compromised on putting them in a shed, not throwing them out, in case she needed something. I guess she hauled half of it back in the house. She was the most talented seamstress I had ever seen, and one of the best gardeners too.