Sydney and Los Angeles au pair

We have 2 girls - a toddler (almost 3 years old) and a 4 month old. We are looking for an au pair who is able to help with our girls in Sydney (Bellevue Hill) Monday through Friday for 5--8 hours per day and ideally also travel with my wife and kids from Sydney to Los Angeles around March 1 and then potentially help us with the kids for some time before returning to Sydney. We are flexible on time in Los Angeles before returning to Sydney (could be as short as a day or several months or longer). We will cover all travel costs to/from Los Angeles and housing in Los Angeles.