There is a principle about psychological counseling. A doesn't consult B. Your brother is B. These conditions are his own. Psychological counseling can hardly help him if he doesn't want to change himself. If you have some emotions because of your brother's situation, you can help you relieve them appropriately.
Everyone has his own life. Since he is your brother, try to respect him from the heart, accept him and accept his choice. If you really want to help him, try to communicate with love, grieve for the feelings of his family with the feelings of accepting him, communicate with him, and ask him what he feels in his heart.
After reading your story, my feeling is that your brother may lack security and love. He feels that he is an unloved child at heart, so he will use these methods to prove that he is not as unloved as he thought. Maybe he is also very tired and hard. If you want him to change, you need him to take the initiative. In addition, this relationship is interactive. When the family sends a signal of true love, send it to him in a way that he can receive, and let him know that he is loved, maybe it will change.
In view of what you said, I can only analyze it with you, hoping to help you. O(∩_∩)O~