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pseudo- +‎ sibling


pseudosibling (plural pseudosiblings)

  1. One who is not a sibling but has a relationship of that kind.
    • 1982, David P. Barash, Sociobiology and behavior
      [] the girls were older than average when they entered the family and thus did not develop the usual pseudosibling relationship []
    • 2007 April 19, Kate Murphy, “Stepfamilies Try to Stretch Their Space”, in New York Times[1]:
      With multiple stepparents, stepsiblings, half siblings and pseudosiblings, it’s a whole new type of family, and with it comes the challenge to design a home where everyone feels welcome.