Your brother needs to either (A) be under 18 or (B) do some serious criminal violence against others to be held against his will for any real duration. Ten day psych holds are about what you can get out of a violent incident and even then, that means that the shrinks on duty think they can get him back to a semi-even keel. I've known some profoundly impaired schizophrenics and even the most scrooge-like libertarian would rather pay for halfway houses than any other alternative. The shitty thing about schizophrenia is if you've had more than a couple episodes, you can kind of expect to be dealing with it through your 50s. The great thing about schizophrenia is once you start treating it like any other disability you can lead a semi-normal life. I recommend E. Fuller Torrey's Surviving Schizophrenia. Your little brother will need an advocate and it sounds like that's you. Cowboy up, and good luck.
I own Surviving Schizophrenia and I coincidentally have E. Fuller Torrey's page open on my wikipedia tab after I saw the book on my shelf and wanted to know who he is. I've been diagnosed as schizoaffective but I think I have schizoid personality disorder. But what do I know. I have another younger brother. It'd be nice if we could all live together and support each other but my family is massively dysfunctional.