Nanny Needed For My Children - Full-time / Part-time

We are looking for a great nanny/babysitter for our 19-month-old son in Los Angeles. We would prefer a nanny who does not smoke and who is comfortable with pets. The role will be in our home and providing extra support and coverage for a grandparent who will be in the home at the time and taking care of our newborn daughter. Mandarin Chinese language fluency is a plus.