Chinese family looking for a helper

We are a Chinese family of 4 people including a working couple, a 3.5 year old boy and a grandma. We are looking for a helper who has at least finished/will finish a contract in HK in the coming May/June and can start working for us in early July. We live in a flat of 850 sqft in Tseung Kwan O and the helper will have her own room sharing bathroom with grandma. We need the helper to take care of our boy and do all the household chores.