In response to: Regional WA Adult undiagnosed sibling showing sign of paranoid schizophrenia
Hey there - firstly so sorry to hear you're going through this, it can indeed be very stressful for everyone involved!
Not sure what kind of paranoia he's exhibiting, but something that could be useful is reaching out to a local (hospital or public health) mental health service. I had a similar situation with my grandmother and got in touch with the local older persons community health group and was able to explain the situation, and find someone who could help navigating steps if/when things progressed or became worse.
The local mental health team were able to visit regularly (under the guise of checking in on an older person) - they might be able to do the same for your brother stating they're there to offer community support or something he might respond positively to. It did get to a point where I had to seek a mental health order because of some behaviour she was exhibiting that was putting her at physical risk, but establishing a relationship with the local mental health services made it much easier to escalate the issue when required.
It's very confronting finding yourself in this situation but remind yourself that you're doing it because you care for them! Definitely check out the resources mentioned in the other reply, it always helps being reassured and well done for coming on here to get advice!