My brother, he spent 28 years living in a small camper tucked in the corner of a barn surrounded by his treasure piled inside and outside of the barn. He never had trash pickup so if he couldn't burn it it just piled up, and for the past 15 years he didn't have running water so used bottles and buckets as his bathroom, then at some point simply started going anywhere he could find an opening.
He ended up in the hospital then rehab and my niece decided to take him to her house temporally. He has been there for six months, has not once taken a shower, doesn't use toilet paper when he goes to the bathroom, for the most part refuses to leave the bedroom. He accuses her of stealing his money, of selling his stuff and holding him against his will.
I could go on and on, it's a sad and long story of dysfunction, alcohol and drug abuse, and likely untreated mental illness.