You did not specify your country of origin, but in England there is actually no law against simply "trespassing". However, the fact that your son has broken into private property and then threatened Mr. Mario, he would be vulnerable to charges related to Aggravated Trespass under the Criminal Justice and Public Order Act 1994. If he physically assaulted Mr. Mario, then he would also be vulnerable to charges under the Offences Against the Person Act 1861. Because Miss Maria is 16, which means she is legally a separate entity and no longer classed as a child under the jurisdiction of a parent / guardian, you yourself could be charged with Kidnapping and (possibly) Extortion under the Child Abduction Act 1984
Again, this only applies if you live in the England. If your country of residence is not England, I advise you to consult a local lawyer / attorney to get the best advice as per your country's local laws.
