In the Practical Guide for Employment of FDH
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produced by the Labour Dept, it refers to Annual Leave in Q4.9 to 4.14
4.14 seems pretty clear that Annual Leave Entitlement starts to be accrued after three months service, just as with any other employment under HK EO. So an FDH that leaves within the first year should be paid for their entitlement.
It also makes clear that the Annual Leave should only be "taken" after a 12 month period of employment has been completed. Hence they can only take the leave that has been accrued to that point and do not end up in deficit to the employer if they leave early. (Again, the same as most normal employers would allow.)