Western family looking for live-in helper

We are a western family with two daughters; 13 and 16 looking for a live-in helper to mainly cook, clean and do laundry. We also have two lovely cats.
Our helper would go grocery shopping, cook meals, clean and tidy-up the house, take care of our pets when we are away, housekeeping sometime and laundry.

Knowing Cantonese is not a must for us but it would be much better if she did.

Also we would want someone who already has a visa.