Does anyone have a parent who is a hoarder?

My mom has hoarding tendencies. She lives in an old two story house with a detached garage/"mother in law" unit. When you visit, as long as you stay in the common areas you wouldn't know, but the garage is full of sheet, the two upstairs bedrooms are full of sheet, and the master bedroom is so full of sheet she and my step father now sleep in one of the other downstairs bedrooms.