The monarchists and intelligencia have been diddling with this idea for ages.
Can't remember the family of geniuses, but back in the 19th century they inbred for generations.
OK, I had to look: "The American du Ponts practiced the same strategy of cousin marriage for a century. Charles Darwin, the grandchild of first cousins, married a first cousin."
The professor, yeah it was a psych class, said it was quite intentional.
Keep it in the family and such. It'll be a long fall.