See also: step-sibling

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step- +‎ sibling

Noun edit

stepsibling (plural stepsiblings)

  1. The child of one's stepparent from another 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 [] .

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