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Abstract

Data from a 2-year sample of 26 families (Time 1 M ages: firstborns 3.1 years, secondborns 14 months; Time 2 M ages: firstborns 6.2 years, secondborns 3.5 years) were assessed for patterns of influence of Time 1 sibling and maternal management styles on Time 2 sibling agonism and cooperation. Time 1 sibling, but not maternal styles, influenced Time 2 interaction; specifically, a sibling social cognitive variable was associated with Time 2 agonism. The synchrony or match between maternal management and sibling behavior at Time 1 was associated with greater Time 2 cooperation and agonism. Affective quality of relationships and the synchrony of maternal management and sibling interaction and associations with longterm sibling relations are discussed.

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