Well, for the public transportation, you could take the bus A21 from the airport and get off at the Prudential Center. The Hotel is located in the walking-distance from the bus stop. Since you have kids together, it is suggested that you take a taxi to get there directly.

Actually, I don't think it is a good ideas to take the public bus with kids and luggages. So, you could take a cab from the airport to hotel, which costs around HKD250.