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Abstract: Around 80% of Americans live with at least one sibling and are reported to spend half of their free time engaged with their siblings (Demographic Research, 2017). Because siblings are in such close contact with one another for large periods of time, they are bound to have an influence on one another. In this study, I sought out to find out how much of an influence sibling rivalries have on one’s academic performance. Using the National Longitudinal Study of Adolescent Health (Add Health) data set, a sample of 864 adolescents from the grades 7-12 were used. The following data was taken to measure sibling rivalries: how often siblings spend time with one another and how often siblings quarrel. Academic success was measured by the average GPA among selected school courses (history, English, science, and math). This study revealed that there is a significant relationship between sibling rivalries and academic success whereas siblings who spend more time and quarrel with one another, have higher average GPAs. Self-efficacy was a third variable used that seemed to moderate the relationship between quarreling and average GPA. Nevertheless, those who quarreled have a higher average GPA as well as higher self-efficacy than those who do not quarrel.
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