My Mum was my twin brothers main carer after my dad died of lung cancer. My brother was drinking drugs crack, she had to sleep with her bag because he’d steal was intimidating. She did everything for him she got him supported housing rehab etc, collected prescriptions he took over her life and i said to her if anything ever happens to you I am not doing it neither his older brother as we have our own young families. Mum died suddenly, i did actually help him move in to another place but he mucked it up again and again and again. He ended up sleeping rough as i couldn’t have him around my kids with his lifestyle again and i was grieving.
Anyway he ended up in hosp with pneumonia and because he had no one else he got put into a hostel and now has a flat. Sometimes if people know there is a support network there they are reluctant to help.