The most cheap way is to take airport bus E11 at the airport and get off at Tonnochy Road/ Hennessy Road. You can find your hotel just around the bus stop. It costs 21HKD per person. 3 year old kid pay half the price. It costs about 350HKD by taxi from the airport to the hotel, but you all can not get in one cab, I think. If you take airport express train to Hong Kong station first which costs 100HKD per person. You should take taxi to your hotel then and the total costs is higher than taking a taxi. It seems airport bus is the best way. Take E11 bus to Lantau Link Toll Plaze and then change to Bus R8 to Disneyland. If you take mtr, you need to make three tranfers.