[RegulatorCountry]

The time to question the appropriateness of their checking into a room together was when they checked in. A simple question, what is your relationship to the young lady, sir? We’re required to be on the alert for potential inappropriate arrangements involving minors, I’m sure you understand.

Calling the police as the first line of “concern” is in my opinion damaging to the point of legally actionable, it was extremely distressing to his daughter and very upsetting to the father to be accused of such a thing by police turning up at their hotel room door.

Sue their pants off. I’m sensing a gender line among those who are saying oh well, better safe than sorry. Ladies, put yourself in these shoes with your son. *You* are being accused of being a pedophile merely for traveling with your own son and checking into the last room available, a double.

No breezy dismissive oh well better safe than sorry then, is there?

[familyop]

"The time to question the appropriateness of their checking into a room together was when they checked in. A simple question, what is your relationship to the young lady, sir? We’re required to be on the alert for potential inappropriate arrangements involving minors, I’m sure you understand."

That's the traditional way of doing it in the U.S.A. There are also cheerful, tactful and sociable ways of finding out.