Kindred and Affinity

As Richard Holden pointed out in the House of Commons today, the legality of marriage between first cousins is a product of the Reformation. Its prevalence until the First World War, and as recently as that, may once have been a badge of English Protestant honour, since Henry VIII had legalised it when he had wanted to marry Catherine Howard, who was Anne Boleyn's cousin.

Until then, the Late Roman ban on marriage to the fourth degree of consanguinity had obtained, extended to affinity because in marriage, "the two shall become one flesh." Catholic Canon Law has therefore always banned cousin marriage, at one time to the seventh degree, although with possibilities of dispensation since the ban was not in the Bible. Such dispensations did not do the Hapsburgs any good.

This seems to be a Two Cultures thing. Although Charles and Emma Darwin were first cousins who had 10 children, and although Albert and Elsa Einstein were both maternal first cousins and paternal second cousins such that her maiden name was Einstein, the mere thought of this practice is profoundly shocking to scientists. But to people formed by the study of literature and history, then, while that is where it belongs, that is where you will find it routinely. Mainstream British society was educated out of it, and not very long ago, so that can obviously be done. South Asians are hardly unreceptive to education.

Anglo-Saxons and Scotch-Irish still regularly marry their first cousins in several of the parts of the United States that were most likely to vote for Donald Trump, and they did so as a matter of course into the very recent past. But if the argument is that this was something that certain other ethnic groups did, then it is probably better to treat it as a health education matter rather than a criminal one. After all, that was what worked with everyone else. Nineteenth-century novels are full of marriages between first cousins as the most normal thing in the world, and Queen Victoria and Prince Albert were first cousins.

By descent from that marriage, the King's parents were third cousins, while they were also second cousins once removed through a different line. But the King is a last hurrah of that sort of thing. His mother was one of the least inbred monarchs ever, and his son and grandson are not at all inbred. Educate people, and it will mostly or entirely die out. That worked with everyone else. Even the Royal Family.