Adelphogamy

Adelphogamy is a form of sexual partnership between sibling eukaryotes, for example in some species of fungi, flowering plants or ants, or in humans.

Amnon and Tamar are siblings who commit incest

In sociology, the term adelphogamy may also refer to fraternal polyandry, or to an incestous relationship between a brother and sister.[1]

References
  1. Rudmin, Floyd Webster. "Cross-cultural correlates of the ownership of private property: A look from another data base." Anthropologica (1992): 71-88.
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