Suicide trigger warning!!

So my brother is a very interesting fella. He used to be very fun and loving when he was younger but he got caught up in the wrong crowd and got in trouble for transporting weed. That brought him down, but he was still optimistic and decided to start a business with his childhood best friends. They had different visions and his friends essentially bailed on him. He was devastated and felt betrayed. There were a few other things that happened that broke his spirit.

The world started to weigh on his shoulders. He became homeless, he couldn’t hold a job, but really he didn’t want to. He stopped believing in money. He was sexually assaulted and just lost faith in humanity.

He started to view himself as a victim where the world was out to get him. He thought his family betrayed him and didn’t believe in him. He pushed away all of his friends. He became secretive and isolated from the world and those closest to him. He lost his social skills and every conversation became an attempt to manipulate others to get what he wanted. He began to steal and tell lies. I [F27] don’t believe he meant to lie, but that he believed them to be true. He broke others belongings and took whatever he wanted from others without asking.

He felt trapped at my dad’s [M73] house because his car was broken down and he couldn’t see a way out of the situation. All the while my dad was giving him $300 a week just because.

He finally ‘escaped’ and went to my mom’s [F64] house. There he yells at her and tells her she was horribly abusive and he uses her facilities yet denies he lives there. He does projects during the day and has started working but he’s angry, unhappy, and says things only to get money or access to her car although he would never admit that she helps him.

He is really against therapy, but he is abusive to everyone he interacts with and he is undoubtedly harder on himself than anyone else. He needs help, but instead my mom and my brother [M38] have been walking on eggshells around him and allowing him to be mean for fear that if they confront him he will kill himself. They keep telling me all the things he is doing that hurt them and all the lies that he is telling about them as well as me. He told one particular one to my brother about my mom that was very illegal and it worries me what he might be telling people.

I asked my mom to give him an ultimatum of therapy or moving out and she was too scared that he would commit suicide. We agreed to find therapists for him and ask him in an intervention type way to please accept help. I will figure out the funds so he wouldn’t have to worry about that.

What do you think? How do you handle a mentally unstable person that is abusive to those around him, but opposition might push him to suicide?

TL;DR: Abusive and depressed brother doesn’t want help and family is afraid of confronting him for fear of suicide