This is really a difficult situation for you and your family. There are many possible reasons why he is like that. Might be from the bad influence? When did he start to become so rebellious? Do you and your family understand him well? Know who is his best friend etc? For now, I doubt he will follow your instructions to go on "World's strictest parent" or listen to a counsellor. However, I think you can seek professional help from Fei Yue community to ask what can your family do to help him.
Is there anything that he does not like but is being forced to do? We need to understand what his mind must be going through to find the root cause of the problem. Maybe have a family outing and give him positive time. With positive reinforcement, the behaviour may change.
Hi there, I’m sorry to hear that you and your mum is going through this. Is your little brother going through a tough time that you don’t know about? Have you tried to listen to him and communicate, if you haven’t? It might take a Long time but don’t give up.
Don't give up on him. Is there any counsellors in his school? Maybe he feels unloved , unwanted and is seeking attention? Try bringing him out, have a meal with him and let him talk about his frustrations etc. This requires professional help... Hope all goes well!
I feel that what I might say is just theory.. See if there are experts in this area. I wish I could help. God bless dear.
Hi... you might find this article informative https://sg.theasianparent.com/staying-course-strong-willed-child
Counselling may help. Sometimes he has issues which he doesn't tell you about.
Maybe you can try MSF. They can help