This study explores the differential contribution of elder siblings' versus parents' acceptance and behavioral control to the psychological adjustment of younger siblings in Turkey. One hundred eighty younger siblings (<em>M</em> = 12.38 years) in intact nuclear families with at least one older sibling (<em>M </em>= 15.79 years) responded to four self-reports. Results of simple regression analyses showed that younger siblings' perceptions of odler siblings, mothers', and fathers' acceptance (but not behavioral control) each made a unique contribution to the psychological adjustment of the younger siblings. Hierarchical regression analyses, however, showed that younger brothers' perceptions of older sisters' acceptance did not make a unique contribution to the boys' adjustment. But all other sibling pairs did contribute uniquely to the adjustment of younger siblings.
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