2. Whoever causes minor injuries due to intentional injury shall be sentenced to fixed-term imprisonment of not more than three years. Since it is a criminal detention, it means that the procuratorate may approve the arrest. Your family's response is too slow. Whether to get bail pending trial depends on whether it is possible to be sentenced to probation. Because your family has not cooperated with compensation, it is unlikely that you will be released on bail pending trial. It is not for you to judge whether the witness has perjured himself. Your family's mistake is that you didn't call the police at the first time, and now you can't get evidence, which is not good for your brother.
3. Intentional injury can cause minor injuries, but the suspect must take the initiative to obtain the understanding of the victim. The reason why the procuratorate didn't arrest quickly is that the case is not big on the one hand, and it also gives you time to compromise with each other on the other. Since your family has been unwilling to shed blood and lose money, it naturally entered the proceedings.
4. After sentencing. I suggest asking a lawyer to respond now. On the issue of compensation, active compensation is definitely more than the amount of compensation pronounced by the court. If the court decides, only ask your brother to pay compensation according to the well-documented medical expenses and lost time. Of course, your family can leave an unnecessary compensation. Of course, the price is that your brother will go to jail and leave a criminal record.