What is a step sibling definition?

A step sibling is a brother or sister with whom one shares no direct biological relationship but who comes from a union between one's parent and another person. Essentially, step siblings are created when two people with children from previous relationships get married or enter a long-term partnership. Step siblings may become part of blended families that include step parents, half-siblings, and step-grandparents. Because step siblings do not share a biological connection, establishing a relationship between them may require time and effort, much as it would with any unfamiliar person.