After you spoil him, society will severely educate him. Isn't he going to depend on others for a lifetime and never leave the greenhouse? Everyone should go their own way independently and bear their own responsibilities and obligations! If your parents prefer boys to girls and you have a younger brother at home, it's easier to live alone than to be dragged down. Bring thousands to honor their parents when they go home for the New Year. Let them know when you get married. Whether you wish it or not. You have your own home, your own life, and your brother's life is not your responsibility.
Your mother's family calls you for money, and you cry poor, so it's hard to sell. Anyway, there is no money until they are embarrassed to talk. If someone wants to see you, you will receive them normally. No matter what they ask, you will cry piteously, making them embarrassed to ask you for money. Men's basic social and family responsibilities, cognitive problems and values. Put it down and have a family meeting. It takes some time and patience to gather several useful elders to share this process and let him know the result of this process.
This is a question of the way of education. For such a person, no matter the people around him inspire him, they are not as good as the incentives he wants, so you have to tell your parents that they can't just indulge their younger brother. After all, parents can't be with him forever. His parents cut off his financial resources. You are trying your best to help him find a job and correct him bit by bit. A dead horse is a living horse doctor. Whether he can make progress really depends on himself.