How to beat my case in court?

it all started like this, my 17 yr old son and i got into an argument and he lied to the police and told them that i threw lighter fluid on him just because i didn't want him to go out (in DE. the curfew for teens is 10:00 p.m. it was a little after 10. and he still didn't take his meds, he's got ADHD and he always refuses to take his meds so we got into a fight and he pushed me down twice! i only had had ONE beer that night so i wasn't intoxicated. he is just a hot tempered kid and he's very disrespectful towards my mother who told him the week before "don't come home next weekend!" but he showed up anyway. he's scared of his father (who's a prison guard) and he lies to his father alot! now what do i do? and i'm also facing endangering the welfare of a child, my 12 yr old daughter just came down the steps, she heard alot of yelling but she didn't see what was going on but the cops were asking her questions i don't know what they were asking her though because i was already in the back of the police car headed downtown what do i do? what is the best way to answer?