The aims of this study were to examine family type (nonstep, stepfather, stepmother, and single mother) and sibling type (full-and half-siblings) differences in sibling relationship quality (positivity and negativity), and to investigate links between sibling relationship quality and child externalizing and internalizing problems. The sample included 192 families with a 5-year-old target child and an older sibling. In addition, 80 of these families included a third older child. Mothers and the older siblings (8 years and older) completed questionnaires and interviews regarding conflict and support in their sibling relationships, and parents and teachers reported on each child's socialemotional adjustment. Sibling negativity (conflict, aggression) was highest in singlemother families and full-siblings were more negative than half-and stepsiblings. There was some evidence that sibling antagonism was associated with more child behavioral and emotional problems, but these effects were moderated by family type.A great deal of attention has been paid to the effects of parental divorce, remarriage, and inter-parental conflict on children's parent-child relationships and socialemotional outcomes. However, very few of these studies have examined the children's sibling relationships . Research on sibling relationships is needed, because siblings represent important agents of socialization, support, and stress throughout the lifespan (Cicirelli, 1996). The aims of the current study were to: (1) explore parents' and children's views of the positive and negative aspects of fulland half-sibling relationships in intact, stepparent, and single-mother households; and (2) test several hypotheses regarding family contextual influences on the links between sibling relationship quality and children's social-emotional adjustment.
Sibling Relationships in Childhood and AdolescenceAlthough the sibling relationship is the longest lasting relationship that most of us will have, researchers know relatively little about the role of sibling relationship quality in child development in comparison to research on parent-child and peer relationships.