Should i make a complaint to the police?

My 12y old son was kicked by another child of the same age, my son retaliated by chasing the boy as the other child was going through the gate to his house my son grabbed his arm, at the same time as the child was closing the gate, although no damage was caused the childs father then chased my child down the street before grabbing him and keeping hold of him while he gave him a piece of his mind. As it was early evening and i was at work i intended on dealing with the situation the following morning by speaking to the police, however i then recieved a visit from a police officer saying the other childs parents have made a complaint of ault against my son. Can i still make a complaint about the child in question? And what about his father, would it be possible for me to obtain a restraining/injunction order to stop him approaching my child as this is not the first time he has cornered my son when he is on his own.