Playstation 2 .
What you need is hidden cameras install in your kids
bedroom & common area like living room & dinning
room - recording & online web viewing.
You can check out ADT or go Sim Lim - where they sell computers
- 2nd floor & 3rd floor have lots of shops that does the setup
and installation.
Of course you will need to arrange your maid to be out of the
house for the installation. She must not know about it or she will
just abuse your children at blind corners or outside the house
instead.
Can check out some products available. search internet for
"Singapore Surveillance camera"
http://www.jiaying.com/_cctv_surveillance.htm
Cheaper options will standalone spy cam - clock with camera
video.
http://www.eurekaplus.com/products.html