Dicky Ticker

If his mates sister went willingly to the sack with the guy why is your son interfering in her life. Secondly if she had been drinking in the pub,why was your mate the landlord allowing a 17year old to be served if that is the case scenario.
Your son has taken it on himself to do this so let him take the consequences of his own actions,he's over 18 and bravado comes expensive when things get nasty.
I have two sons and from the time they have been over 18 they have been responsible for their own conduct in life.
He,your son,made his bed so let him lie in it and perhaps he will become a bit more thoughtful before his fists start before his brain and expects you to bail him out of the ****.
Not quite the same as a car breakdown where he asks for a bit of help,is it? I am not advocating standing idly bye,but it really is not your problem as far as the repairs are concerned.