Darling girl, you are not responsible for your addicted brother, your mum, your disabled brother. You are responsible first for your own wellbeing. You are not responsible for their happiness. I totally understand why you feel you are, l was in a similar place, and still am somewhat, but have been working on it. Cutting the strings doesn’t mean you cut off everything, but you put your own lines in place. Difficult but has to be done. Good luck my lovely. x