Desperate, I too have had thoughts of buying something for my AB to live in. But...like your situation, it wouldn't be fair to those living around him. He's not violent. He's a hoarder, and though he isn't homeless, he lives as though he is. The place would be unlivable within a year. We actually own a house with an apt. Where he could live, but I won't do it. We would never get rid of him once he moved in, and he would trash the place. I agree with LexieCat. Hard as it is, step away. You are no longer your sister's keeper. For your own serenity, step back.