Common
Stepsibling
Child of a step-parent to whom one is not biologically related
Stepsibling
Stepsiblings are children born of two different families who have been joined by marriage. A male stepsibling is a stepbrother and a female is a stepsister. The stepsiblings relationship is connected through law and is not a blood relation. Stepsiblings are sometimes abbreviated informally as stepsibs.
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