Your family should entrust a lawyer as soon as possible, and the lawyer will go to the police to understand the case and go to the detention center to see your brother. In the investigation stage, lawyers can only learn some basic information from the police, such as the alleged charges and amount, and detailed evidence and transcripts are not given. But when you meet your brother, your brother can give a detailed introduction to the lawyer.
Because of the lawyer's discipline, even if the lawyer knows the details, it is impossible to tell you all the contents, especially if you have an accomplice, but if you just report peace and tell how many crimes you have committed, it is no problem.
4. If you want to entrust a lawyer, it must be entrusted by a close relative, and the police will examine whether the client is a close relative. It is best for a spouse to get a marriage certificate; If it is someone else, it is best to have a household registration book on one; If they are not in the same book, they must have a kinship certificate issued by the local police station.
You made a small mistake. You should do these things when you go to Shanghai. At least go to the detention center and give your brother some living expenses.