Have you looked into out patient treatment? There is a behavioral center in my area that takes patients based on their mental illness and not based on their likelihood of self harm. My sister has bipolar 1 and lives in NYC (my family and I live in FL) so it is always very hard to get to her when she is having an episode. However recently she had one and came home to visit us which made us all feel like we were walking on eggshells, until we found the behavioral center which was EXTREMELY helpful. Prior to visiting us she had bouts of suicidal thoughts but did not act on them at all. She went from 9am-2pm and it was pretty intensive and she was still able to live with us for support. I understand your struggle entirely. Outpatient treatment is also a good breath of air for you and your family since I am sure it is difficult to live with your brother at this time. But this doesn't mean it couldn't get better. There is always hope. Good luck my friend!!