Urgent: Need help with parents

So I thought my dad was cool with me racing but apparently he isn't. He's even asked my what class I was racing and we've talked about it for some reason it's a problem now. He thinks I'm going to break something. Yes my car is old, but I keep up with maintenance.

What would be some good reasons why he should let me race?
There is an autocross on sunday so I've got a day to convince him.

4/22 MPH autocross

didn't know where to put these so I figure media was best.

Got to autocross on a road course today. It was amazing. I love my 36/22 bar combo and poly bushings and endlinks.

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