Of course he is going to say that you hit him first. He doesn't want to get into legal trouble and go to jail. Of course he is going to lie his pants off. In his mind "it's either you or me". Do you think he wants to go to jail or have a record? Of course not. So don't take it too personally that he is lying and accusing you. He feels "how can my own father do this to me, so I am going to do it to him right back". That's not something to take personal because most people lie in these situations because they don't want to go to jail.
The question is, what are you going to do? Friday is coming up really soon. Just make sure whatever decision you make doesn't involve pride. What is the best for everybody right now? That's what you need to decide. It seems like you have three options, prosecute him, him prosecuting you, both of you going to trial, Dropping charges and him coming back home or him living with grandparents for the time being.
