will keep your brother in my duas but i honestly think some dark mental hospital is not the best place for him as the statistics have shown the suicide rate is high and as soon as they leave those places its like they are more messed up then when they were going in that is because they are surrounded by other more seriously ill mental patients.
if a person like you or me were taken to some run down orphanage and saw other kids acting weird after sometime we would copy their behaviour and we would be no better off so its the same thing and i am also talking from experience who has gone through this with a family member thats why nurses have only a 3hour shift per day only in most countries, they are not allowed to work any more then that for mental health reasons..
so my advice to you is take him out because what he needs is to be around family and SANE people, i would also advise to get more tests done.