First, your father is now in hospital and continues to treat his ears. The medical expenses and the resulting lost time and nutrition expenses shall be paid by the beating party. You should collect hospital bills and sick leave certificates. Because you have filed a lawsuit now, when you ask them to add medical expenses, you should go to the court to add your claim, so that the court will inform the other party of your additional amount, and then both parties will cross-examine this part, and then your evidence will take effect.

Second, because it is a minor injury case, the court will accept it as a criminal case only if the procuratorate files a public prosecution, and the court cannot decide to close the case as a criminal case alone;

Third, mental damage compensation should have compensation, but because there is no uniform standard for the amount of compensation in mental damage compensation at present, some areas do not support mental damage compensation's compensation. You'd better check whether there is any precedent for mental damage compensation in your local court. If so, your appeal will be supported. If not, the court will relax the standards in other matters and won't let you suffer too much. The court will coordinate the other party not to accompany you, and finally the court will make a judgment, just whether the other party cooperates or not.

I hope my answer can help you!