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What is assortative mating?
https://en.wikipedia.org/wiki/Assortative_mating:

Assortative mating is a mating pattern and a form of sexual selection in which individuals with similar phenotypes mate with one another more frequently than would be expected under a random mating pattern. Some examples of similar phenotypes are body size, skin coloration/pigmentation, and age. Assortative mating, also referred to as positive assortative mating or homogamy, can increase genetic relatedness within the family.

So the Howard Families from Time Enough for Love might not be that far-fetched.