Yes, I did speak to his father - who is a decent man trying to raise decent kids and for the most part succeeding (even this kid really isn’t doing anything seriously problematic - it’s just that if he’s not pulled up now, it’s likely to get worse and worse).
The boy has been very polite to me on the couple of occasions I’ve seen him since.
Good for you! And good for his Dad. If they are not taken to task they will just keep pushing that envelope! Look at the mess we here in this country are in because of so many single parent homes and the kids are raising themselves! Very, very, sad!