Sibling relationships are usually the ones that last the longest of any relationships in our lives. It’s also key to recognize that sibling estrangement is not as rare as many think. They also found that sibling estrangement was often temporary and more likely in situations where significant family transitions were more frequent. It’s More Than a Single IncidentRegardless of the relationship, estrangement is rarely about a single incident between two people. — Initiator of Sibling Estrangement, in her 60sFor some participants, estrangement represented an act of self-preservation rather than rejection.