My sil has a history of mental illness, in recent years exacerbated by alcoholism. She goes from being ok to having breakdowns. She has three children, , 11, 9 and 7. My brother left her for somebody else last year. She has friends but their involvement only goes so far. No family. She sees a counsellor twice a week but so far this hasn't stopped the breakdowns from happening. She takes ad's. Her only real support is my mother, who is nearly 73. This just feels so wrong. She is not in the UK. How much can my brother be told that he should be involved? I know he can't be forced, but what is morally right?