My 13year old son and two friends who spent the night played a prank on a neighborhood boy's house. They toilet papered the trees in their yard late at night. My wife and I found out the next day and sent the 3 boys down to apologise and clean up the mess. Unfortunately, as it turns out the neighborhood boy's father is somewhat of a lunatic. While they were cleaning up the mess, the father corraled one of the boys and kept him in check while strongly encouraging his son to hit him. His son gave that boy a black eye and a welt on the back of his head. My son tried to tell him to stop it, but the father threatened my son, telling him to back off or he would beat him up.
I would like to press charges against this man. Other than the people in their household, the only witnesses were my son and his two friends. Is there anything I can do? If so, what kind of an attorney would I engage?