Eucharia Nchedo Aye, Immaculata Nwakaego Akaneme, Eberechukwu Blessing Magbo, Tochi Emmanuel Iwuagwu, Uchenna Nichodemus Eze, Sibling Relationships as Correlate of Adolescent’s Adjustment in Secondary Schools in Enugu State, Nigeria, International Business Management, Volume 11,Issue 5, 2017, Pages 1015-1020, ISSN 1993-5250, ibm.2017.1015.1020, (https://makhillpublications.co/view-article.php?doi=ibm.2017.1015.1020) Abstract: This study investigated sibling relationships as correlate of adolescent’s adjustment in secondary schools. The area of the study was udi education zone of Enugu State, Nigeria. The purpose of the study was to investigate the relationship between sibling relationships and adolescent’s adjustment in secondary schools. The study adopted a correlational survey research design. The sample of the study was 420 senior secondary class two students drawn through multistage sampling technique from a population of 2446. One instrument Sibling Relationship and Adolescent’s School Adjustment Questionnaire (SRASAQ) in two clusters was used for data collection. Pearson’s product moment correlation was used to answer the research questions while multiple regression was used to analyze the hypotheses. Major findings of the study revealed that the nature of adolescent’s sibling relationship is positive. Adolescents adjust positively academically and negatively socio-psychologically. Therefore, there is a positive relationship between sibling relationship and adolescent’s adjustment in schools. Based on the findings, it was recommended that adolescent students be given orientation geared towards building healthy relationship with siblings through cooperation and support. Parents, guardians and the society at large should be sensitized on the need for the adolescents to have good school adjustment. They should be made to understand that how a child is reared goes a long way to determine the later adjustment in life. Children should be treated with equal love and care. Keywords: Sibling relationships;adolescents;adjustment and secondary school;cooperation;determine