In Tuen Mun, (and I'm sure other towns?), there is a scheme run by the Govt. which is a network of trained 'babysitters' and even regular daycares. It is rare for Gweilo to use them because the service is not readily advertised even in Cantonese.
In Tuen Mun:
Under 2 years = 20HKD p/h
Over 2 years = 13HKD p/h
and of course it's not means tested, it's for working people.
Reminds me a bit of hemskole actually..
My point is that a helper will cost a little over 100HKD p/d and this guy has two kids, I may not be bryant.maths but I'm pretty sure I'd be getting a helper.................wait a minute, that's exactly what I did after a couple of months of by the hour!! ding dong!