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| Charles and David are step-siblings as they are joined by the marriage of their parents Ben and Agatha. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Step-siblings are children born of two different families who have been joined by marriage. A male step-sibling is a stepbrother and a female is a stepsister. The step-siblings relationship is connected through law and is not a blood relation.
Step-siblings are sometimes abbreviated informally as stepsibs.[1]