My brother was instigated to cut off someone else's finger. How many years will he be sentenced to?

Article 234 of the Criminal Law: Whoever intentionally harms another person's body shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance. The degree of disability of your brother cutting off someone else's finger is the basis of conviction, but the maximum sentence is three years.

You said someone incited your brother to cut off someone else's finger. If this person instigates your brother to cut off others, it is a crime and should bear criminal responsibility. There is a difference between incitement and instigation in principle. Incitement is not the same crime. According to the provisions of the Law on Public Security Administration Punishment, this person will not be punished, but will be punished by administrative detention 15 days.