You are honestly claiming that I would legally have to sit around and wait for them to decide to leave my home? That as long as they were invited in by a minor who resides in my home, I have no legal say in the matter?
I think that you can order them to leave, and have them removed by law enforcement if need be, but you can't beat them with a pool cue and then shoot them.
You have sized up the common sense reality of this kind of behavior. That should be the first consideration in such situations, but for many reasons, we don't all have or use it.
The father, in this case, surely had reason to be outraged...at his own child and the young man. I tend to believe he was not a thinking, reasonable person to begin with or he would have found a much better way to handle the problem.