A question about egging.?

Me and my brother(both over 18) went to buy eggs for our mom who was making brownies at home. On the way home my brother dared me to egg a car and even though i didn't want to, i still did. (and i regret it, i feel so bad especially since my car has been egged before and i know the feeling). The problem is that the car we egged actually caught up with us and forced us to stop, It was a son and his dad and they threatened to call the cops but we apologized to the father and he was cool about it. But then his son(who is over also 18) egged our car back but with like 4 eggs. I accept that as payback but that's not the question;

The problem is they took our license plate, assuming they call the cops, could we get in any trouble seeing how they egged our car too? (i know that egging is vandalizing and gets a heavy fine + possible jail time, but i want to know if they would get some sort of sentence too)

Also, The son also had a car wrench in his hand and was provoking us to fight by pretending that he was going to hit us with it. So I'm also wondering if the police was called on us if the son could get some sort of threatening case against him.

(Please don't post about how egging is wrong, it was the first and last time and the lesson was DEFINITELY learned, never again!)