I'm sure the Father knows how the son screwed up big time! If it were me I would let the Father have the talk with his son. Sure your are mad but this is more of a Father/Son situation than anything! I think the kid would get more out of it hearing how he screwed up coming from his Dad! JMO!
His father is the one who allowed a 14 yr old access to a 30-30 rifle to shoot at a game animal on a Sunday that NEITHER one had a clue whether there was a season in for that animal, or not. EVERY situation is different. I know these people REALLY well....and I'll have a separate conversation with dad. MY son's over there, sometimes. If a 14 yr old has carte blanche access to those type firearms.....I need to know it.
I've hunted with this young man before.....and he's been at my house shooting bows. I'll have my own talk with him.....and I'll let dad know that, too. THAT will be fine.