My 80 yo mother is addicted to my drug-addicted nephew

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2. the sperm donor has never been in his life, and my sister died 8 years ago

very suddenly and tragically from inflammatory breast cancer. while she was in the hospital, she kicked him out of her house, and told my mother not to let him in her house. of course she did, and the rest is history. he plays on her emotions because of my sister's death, but his youngest sister was in high school when she died, and his other sister was a freshman in college. the girls have honored their mother by doing well, while he has made excuses for being an asshole. i offered to get him into to rehab, using his money from his mother's trust, but he refused. now my mother is obsessed with getting him into rehab, so he has housing, but at this point...i don't care what he does. i just want my mother to be away from him, even if it is against her will.