criminal case
In criminal cases, a lawyer can only represent one defendant. Now there must be lawyers in criminal cases (such as Beijing, a pilot city now).
civil case
In a civil case, multiple defendants can entrust a lawyer at the same time. However, if there is a conflict of interest, the same law firm is generally not allowed.
What is your specific situation? You need specific case analysis.
If you have any questions, you can continue to consult with Beijing Daosheng lawyer Zeus.