I don't know your dad but as a generelisation it's very rare that men of that age express a preference for anything much at all.
That he has asked for you all to go to Hong Kong would suggest to me that it is important to him. What Dingdell said is spot on, it's just a game of cards at the end of the day.
If it were my Dad, I'd pick Hong Kong every time, but it's your desicion. You'll know how important/not important it really is to him and can choose from there.
I have to agree , family 1st