This is potentially outing so I have NC. It is a long story, so please bear with me.
We've never been close and have had several years of no speaking. I don't really like him - he's very arrogant, abrasive and is one of those people who has rewritten history and genuinely believes it. He lived with my dad for a long time, but a couple of years ago he moved to Oz on a travelling visa. I saw him just before - I was the first person he phoned when he thought his GF was pregnant (and I'm not really sure why) but it turned out she wasn't. He had been out of contact with my mum for years but asked me if I could help them reconnect - so I did.
After Covid became a problem, he started posting a lot of information on FB about this pandemic is the worse that's ever happened and the world is ending. I replied to one (and only one) such comment with a link to the Spanish flu. He blocked me on all SM afterwards. He also blocked my dad and all of my dad's family.
I've been quietly keeping an eye on things anyway through a fake account and his statuses have escalated to youtube videos. I have been dipping in watching them over the past few months. Since August, he's been convinced the rapture is coming and the world will end in a couple of days.
This comes from mum. She used to talk about revelations and everything that would happen when we were younger. It caused me an awful lot of anxiety growing up and it took me a long to time to break away from it. I am now a very firm atheist. My brother has always believed but has dipped in and out - the statuses and videos all coincide from the time I helped to reconnect them.
The videos are concerning me. He keeps talking about how he can't wait for the rapture to come - how he's praying for it, etc. The latest video he talks about how he has no home (lives in a car), turned down for benefits as in between visas, not able to get a job, no possessions, no family except his mum and GF (he says this is not his fault but conveniently forgets that he blocked everyone). There is an extreme desperation in his videos. I am convinced he is depressed and this way of thinking is making it worse.
I am increasingly worried that when the world doesn't actually end, he will do something. I might be wrong, but I'm really concerned.
I am no contact with my mum. I do have her number and could raise my concerns but she would bat them away and tell me I need to repent and what he's saying it true. My mum also has severe MH issues and is generally quite unstable too. DB has comments disabled on youtube and FB (so no chance of posting anonymously), and even if I could get in contact I don't think he'd listen to me. He isn't open to discussion - his preaching is very much "this is THE TRUTH and don't criticise me - educate yourself". In fact he'd probably bully me about not believing.
There's a part of me that thinks I need to step away, disengage with it all and accept that it's entirely out of my control - but if anything happens - how do I live with that knowledge?
I don't know if I'm asking for advice or just want to get it out - but if you have read this, thank you.