There is certainly a knowledge of keeping bloodlines pure in Tolkien especially with the Dunedain where the purer houses in Gondor are the longest lived and their lifetime is less than those of the North because of mingling with lesser stock. Of course in the real world inbreeding is much more likely to cause a diminishment in health and mind.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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