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My SIL as well. At one time, she also hoarded cats. 30+, as well as all of the junk she wouldn't throw away. When the bank foreclosed, her husband took them all to a shelter. Sad.
What boggles my mind (aside from the obvious) is that they all pick on each other about whose house is worse.
"Oh I know mine is bad, but you should see ______ house!"
I always want to tell them that just because your mom or whoever has a house full of crap doesn't make your house clean by default.