You will not be subject to the penalty because they were out of the US for 330 days prior to entering the US, therefore, they were not required to have insurance.
The tax penalty for not having health insurance in 2017 can be waived if the individual was a U.S. citizen or resident but lived in a foreign country or U.S. territory for at least 330 days within a 12-month period that includes all or part of 2017.
[Edited 3/11/2018 7:33PM EST]
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