Obviously at some level it's a degenerate question, because ultimately every human on earth is related.
So given that we are really good at genealogy these days, it probably shouldn't be surprising that there are oodles of them that we know of.
Looking over the link provided by Lars in the comments, it looks like the closest related triple were Madison, ...
Bundling was a technique of separating two people of the opposite sex by textile devices to allow intimate contact without the possibility of intercourse during courtship.
It is thought to have originated in the British Isles in the 17th century. Further information can be found at Wikipedia and Atlas Oscura.
According to both the Antoine de Saint-Exupéry site representing La Succession Saint Exupéry – d’Agay and the 1994 Stacy Schiff biography Saint-Exupéry, he did not have any children even though he had often expressed a desire to start a family.
Antoine de Saint-Exupéry's marriage (1931 - 1944) to Consuelo Suncín was childless. Earlier, in 1923, he had been ...