Hi everyone, I know you all have a lot on your plates, and completely understand if you don't feel like advising a stranger about someone who \*may\* have BPD. If anyone has the time and inclination though, I'd really appreciate your insight: 

I (41F) think my 38-year-old brother might have BPD, and would like advice on how to deal with / help him in case he does. I'm not looking advice on whether he has it, I know that's not what this space is for - it's my best guess at the moment and I may of course be wrong.  

As far as I can tell, most of what is going on with him is fairly new, or at least, mild personality traits he had before have become really extreme: He started changing over the past two years - the pandemic has been very difficult for him in various ways - and things have become really bad over the past 8 months or so, during which his girlfriend left him over his anger issues. 

The main things I'm seeing is that he has become extremely angry at pretty much everyone who has ever been in his life; that he is very paranoid; that he behaves in very thoughtless / entitled ways in family members' houses and flies into a rage if anyone dares comment on it; and that he is hypersensitive to anything he perceives as criticism. He's projecting a lot, ascribing a lot of the behaviours above to other people. He is also clearly extremely unhappy / depressed.

He isn't seeking help because he doesn't think there's anything wrong with him, he thinks the problem is everyone else. He thinks lots of people have betrayed him or are actively plotting against him, he doesn't see that his erratic behaviour has pushed many of them away.

I'm very, very worried about him - aside from the pain I think he must be in - which is bad enough - he has alienated almost everyone close to him including in his field of work, and I think he's in serious financial trouble and at risk of losing his home. 

Until this started, we always had a pretty friendly, but not close, relationship. A few months ago he was also angry at me for things he thinks I've done wrong (fair in some cases, not in others), but that seems to have subsided a bit. We're still not close though, and I feel like I'm walking on eggshells to try and maintain what relationship we do have. I haven't dared suggest he seek help because anything even vaguely hinting at that will cause an explosion.    
He is hard to be around, and often doesn't want to talk or meet, but I want to be there for him as much as I can, especially as he has so few other people left. 

Assuming he does have BDP, from your experience, what might be ways to try and constructively engage with him, support / help him if possible, and ideally get him to realise he needs professional help?