My sibling (30/M) is living his entire life undiagnosed and untreated. His perception is that people think he is "crazy" because of the way he is and the way he thinks. I have only figured out these last couple of months that he might have PD. 

He's had a psychosis a few years ago and was forced to enter a psychiatric facility where he was put on medication. He hated it and says that the medications makes him numb. He convinced my parents that he would keep taking the medication if they signed for him to leave the facility. He did not keep that promise.

In the report of the facility, it was mentioned that the marijuana he smokes makes him paranoid and that he should not smoke it anymore. They did not however, mention anything related to PD. He only stayed there for maybe 2 weeks.

Reasons I think he has PD:
-When he's walking outside, he thinks he's being watched by everyone. Even if they are only looking in his direction but not directly at him.
-a lot of angry outbursts
-He can't keep a job because he thinks everyone at work is out to get him. If someone makes a comment on something, he will think that this person hates him and wants to fight him.
-He is extremely sensitive to everything. 
-little things, such as making phone calls, stress him out
-if you disagree with him, he gets very angry. 
-he trust literally nobody. Only my mom 
-he doesn't keep friends. He isolates himself because he doesn't trust anyone
-he feels like no one in the world understand how he feels 
-he feels extremely lonely

My parents do not understand mental health and have no idea how to handle the situation. My mom keeps giving him money every week ( he asks for money a few times a week). When she has no money for him, he gets angry and tells her that she should have never gave birth to him if she can't help him financially. He also tells my parents that it's their duty to support him financially.

The reason why I'm posting here is because I want to introduce him to PD. I'm hoping that he might realize he is not the only person in the world that goes through this. And I'm hoping that he will understand what therapy can do for him. My mom convinced him to go to the doctor and to explain his daily struggles to them ( we don't what he told them). He did end up going, but told us that hoesn't trust the doctors at all because they prescribed him medicine. He said that he is perfectly fine.

My question is, do you guys think I should try to introduce him to PD? I want to send him a good introductory YouTube video but I can't find one. All the ones I've listened to are very intense and I don't want to scare him immediately. I am also worried he might lose the little trust he has in me as now I am also one of the people who thinks he needs professional help. I would appreciate your help a lot and sorry for the long post.