Hello :)

Sorry to say this, but they will not change until/unless they want to change.
A good book for you to read is "Digging Out".
It could help you to understand this condition better.

Good luck and best wishes. :)

My sister and i have lived with this our whole lives. Wherever we have lived with our parents its been okay for the 1st year and then the hoarding will begin again. I moved away for college and moved back in with my parents and sister only to be overwhelmed by the amount of clutter. Both my parents are older now so they dont have energy to clean as much and my sister hasnt tried to help at all. I will declutter an area and a week will pass by and its full of stuff again. Im going to be moving out in a year and really wanted my parents to have a clean house by the time i left but with the way things are going i dont think thats going to happen. Theres other things i need to be doing for myself but im too obsesswd with cleaning the space. I cant talk to anyone about this except my sis whos tired of hearing it and chooses to ignore it. Im so frustrated and im trying not to berate my dad about it but i cant help it idk what to do