Do you not have something concerning this in your contract? I put that parents are always required to have a plan B regarding childcare and it is up to them to provide alternative care when my vacation and holidays come around. I have had parents ask if I can watch kids on my vacation time. I always say no and then forget about it. Only you can allow their comments to ruin your own vacation. Just take the days and they will have to plan accordingly. Do not even apologize, you aren't doing anything wrong.

I do provide a list of local providers that accept temp. kids but it is up to the parents to arrange that themselves.

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