Answered by Kevin from Singapore
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Apr. 27, 2016 20:46
According to your situation, you can just purchase the Standard Octopus Card for the 3 days trip in HK.
For airport express, you can take the group tickets type: Group of 4 + Group of 2.
Child Aged 3 to 11 can enjoy the half price tickets: 50 HKD to HK Station; 45 HKD to Kowloon Station; 30 HKD to Tsing Yi Station. And child under 3 years can enjoy the free tickets.
Besides, each Octopus Card can only be used by one person. You need to know that. :)