A family of three, daughter 16 years old or above, can live in a standard room, want to stay in Ruxin Hotel in Hong Kong?

It is definitely not allowed in the regulations. Give it to the hotel. I'll charge you extra. But no one asked you to tell each other that there were three of you. Just don't go together when you check in, but go up separately when you go to your room. Don't let the waiter see three people enter the room together.

You'd better know the size of the double bed in the double room of this hotel first. If it's a bed of 1.5 meters, it's definitely no problem for three people to live. But if the bed is only 0.9 meters or 1.2 meters, it will be more troublesome to sleep, because the bed is very narrow, and the double beds in many hotels in Hong Kong are so small. So ask before making a decision.