quaternary twin

English

Noun

quaternary twin (plural quaternary twins)

  1. First cousins whose parents are a pair of identical twins.
    • 2022 February 24, Michelle Butterfield, Global News‎[1]:
      Quaternary twins are defined as the offspring born less than nine months apart to two sets of identical siblings. They don’t share a womb, or even a parent, but the DNA they inherit from their twin parents makes them not only cousins, but genetic brothers.
    • 2023 May 5, Diane Herbst, People‎[2]:
      The boys — who are not only cousins also genetic siblings known as "quaternary twins" — share the same room and have close relationships with all four adults.
    • 2024 March 18, Rachel Abrahamson, Today‎[3]:
      Quaternary twins occur when one set of identical twins has children with another set of identical twins.
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