Alfrin, Middle-earth does have similar relational laws as we do. Ar-Pharazon married his cousin, which was considered incestuous to the Numenoreans (noted, in some places it is not considered incestuous to marry one's cousin, but if they thought that that was immoral, then there seems to have been a certain amount of taboo connected to marrying relatives.
Sorry, had to indulge the bunny-trail.
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