Chinese Family looking for helper taking care of babytwins

We have twins at  6-months old need help. The helper will share room with twins. Currently we have a part-time taking care of cooking and housekeeping of adults. We also have a 3.5-year old boy and grandparents are taking care of his daily activities. He sleeps at parents room. Grandparents do not live in the same house but we have lunch and dinner together. The current priority is twins' needs however the helper should be willing to/able to cook/ houseclean/ do other required duties when necessary/ available. The house has 2 rooms and an open plan kitchen with 2 bathrooms.