List of coupled siblings

This article gives a list of individuals who have been romantically or maritally coupled with a sibling.

[4] A similar incestuous arrangement which is non-monogamous can be referred as sister-swapping or brother-swapping,[5] although this should not be confused with berdel, which describes the situation in which families exchange brides or bridegrooms.

[6] Sibling marriage was historically practiced among royalty in ancient through Ptolemaic Egypt, in the pre-Columbian Inca Empire of Peru, in pre-colonial Hawaiʻi, sporadically throughout Eurasia, and in various other places.

While cousin marriage is legal in most countries today (less often with regard to first cousins), and avunculate marriage is legal in several, sexual relations between siblings are considered impermissibly incestuous almost universally.

Innate sexual aversion between siblings forms due to close association in childhood, in what is known as the Westermarck effect.