HK couple with a 9-years-old son looking for domestic helper

A couple with a 9 years old son living in Yau Tong is looking for a helper. We are both working so we need a helper to take our son to and from school and cook dinner. No elderly, no pet, no car and no garden with us. We hope that the helper can watch our son to do homework and talk and play with him while we are at work. The helper also needs to go to market and cook dinner by herself. She will share room with our son. Day off will be of the pattern of two Sundays and one Saturdays. Special requirement of day off can be discussed. We are a small family and the housework is simple. We are nice and our previous helpers had all worked at our home for more than two years.