Chinese family looking for helper

We are a Chinese family with 3 adults (working couples with a 60-year old grandma) and 1 kid (1.5 year old boy). We lived in Taipo and the apartment is 1000sqft. The main duties are: taking care of the child, cooking, housekeeping and go to market when necessary. Grandma is healthy and no need to take special care of. We prefer the helper having the experience of taking care of young kids (1-3 years old), cooking Chinese food (or be willing to learn it). Understanding Mandarin is a plus but not compulsory. We can provide a separate room with an independent washroom, and the provided monthly salary is HKD5000 (negotiable).