Honesty's best policy for antsy au pair
There is a risk they could panic and run off to hire another nanny to replace you before you've secured other employment, but this is unlikely -- they appreciate you and should be happy to employ you as long as you are available.
Tell them: "I love this job and plan to stay here as long as possible, but I have started a job search in the corporate world. I don't have any prospects yet, but I wanted to let you know." Assure them that you'll give them as much notice as possible.
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