Sibling relationships represent one of the longest-lasting interpersonal relationships in an individual’s life. Subjective well-being refers to an individual’s overall evaluation of life, including feelings of happiness, satisfaction, and fulfilment. In this context, the present study aimed to examine the relationship between sibling relationships and subjective well-being among adolescents across gender in the state of Karnataka, specifically in Chikkamagaluru district. A quantitative research approach was adopted, using a correlational research design. Purposive sampling was employed to collect data from 120 participants, comprising 60 males and 60 females, aged between 17 and 21 years. Standardized psychometric tools were used for data collection, including the brother–Sister Questionnaire developed by Graham Berman and Cutler, which assesses four dimensions—empathy, boundary maintenance, similarity, and coercion—and the Subjective Well-Being Inventory developed by Ed Diener et al. The collected data were analysed using SPSS software. As the data were not normally distributed, non-parametric tests such as Spearman’s rank correlation coefficient and the Mann–Whitney U test was applied. The results indicated a negative correlation between sibling relationships and subjective well-being among adolescents. Additionally, significant gender differences were observed in sibling relationships and subjective well-being. The findings highlight the complex nature of sibling interactions and their influence on adolescents’ psychological well-being, emphasizing the importance of considering gender differences in family and mental health research.
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