This isn't my problem, but I feel bad for my friend and some ideas of what to do with specific categories would be helpful. My friend's mother died last year, and she was a (clean) hoarder. They've been attacking the sheer mass of stuff and it is simply unending. My friend thinks they've gone through about 1/3 of the total.
So, they have boxes and trunks and tubs in the basement FULL of children's clothing. Everything that my friend ever wore, and plenty that she probably didn't wear, is all there. All of it. Birth to when she moved out in her 20s. Thus far, it hasn't been tackled because they don't know what to do with it. She was born in mid 1980s to give you a sense of fashion. Any ideas? All I can think is fabric recycling.
Similar category, but adult woman's clothing. Decades worth, and her mother was not fashionable.
There's also the doll room. Yes, a room. Full of dolls. Some of these are going to be your run of the mill dolls that little kid played with, but most of it are collectables. And of course, all the associated clothes, accessories, carriages, beds, etc. It is slightly creepy (very creepy if its dark). What do you do with all that stuff?