This volume in the Applied Developmental Psychology Series consists of a collection of papers on current sibling research and theory. Prominent researchers and academicians in developmental psychology present reports on aspects of sibling relations in an effort to better understand individual and family growth. These scholars have dealt with questions of social and emotional development, the role of shared and non-shared environment on siblings, consequences of divorce and other family difficulties, and ways to treat sibling and family problems. The specific topics of study included: (1) "Siblings, Parents, and Peers: A Longitudinal Study of Social Influences in Adolescent Risk for Alcohol Use and Abuse"; (2) "Brothers and Sisters in Middle Childhood and Early Adolescence: Continuity and Change in Individual Differences"; (3) "Sibling Relationships in Middle and Old Age"; (4) "Siblings, Behavioral Genetics, and Competence"; (5) "Adult Sibling Relationships: Racial and Ethnic Comparisons"; (6) "Personality and Sibling Relationships"; (7) "Delinquency and IQ: Using Siblings to Find Sources of Variation"; (8) "The Family Contexts of Children's Sibling Relationships"; (9) "Negative Sibling Interaction Patterns as Predictors of Later Adjustment Problems in Adolescent and Young Adult Males"; and (10) "A Risk-Amelioration Model of Sibling Relationships: Conceptual Underpinnings and Preliminary Findings." (SD)