Sibling estrangement or sibling alienation is the breakdown of relationships between siblings resulting in a lack of communication or outright avoidance of each other. It is a phenomenon that can occur in families for various reasons such as unresolved conflicts, personality differences, distance, or life events. Similar to family estrangement, sibling estrangement is also linked to disruptive family events, such as parental divorce or the death of a family member. It includes emotional and physical distancing of siblings. It is a voluntary and intentional process in which at least one sibling creates or keeps distance from another sibling, triggered by a negative relationship between them. It can happen at different ages, in the majority of cases it happens during adulthood.[1][2]