Journal for Re Attach Therapy and Developmental Diversities eISSN: 2589-7799 2023 December; 6(10s2): 1954-1962 1954 https://jrtdd.com Quality Of Sibling Relationship And Psychological Well-Being In Adults: Impact Of Sibling Dyad Dr. Jeronimo D’Silva 1* , Dr. Vijay Viegas 2 , Dr. Joslyn Henriques 3 1* Department of Psychology, Rosary College of Commerce and Arts, Navelim, Goa, India. Orcid id:https://orcid.org/0000-0003-3222-5071 2 Abbé Faria Post Graduate Department of Psychology, St. Xavier’s College, Mapusa–Goa, India. Orcid id: https://orcid.org/0000-0002-9891-5393 3 Department of Psychology, Dhempe College of Arts and Science, Miramar-Goa, India. Orcid id: https://orcid.org/0000-0002-8288-7922 *Corresponding Author: Dr. Joslyn Henriques *Assistant Professor, Department of Psychology, Dhempe College of Arts and Science, Miramar-Goa, India Email: joslynhenriques@dhempecollege.edu.in, Contact no.: +91 9604344391 Abstract Family is said to be the foundation of an individual and is an indispensable part of one’s life. Families include a bunch of relationships such as marital relationships and intergenerational relationships like parents, grandparents, and siblings. A positive and healthy sibling relationship in the family plays a vital role in elevating one’s overall well-being, self-esteem, and satisfaction with life. Earlier research on the outcome of sibling relationship quality has highlighted the significant part played by siblings throughout lives. Healthy sibling relationships help an individual to develop compassion in life and appropriately resolve conflicts. For the present study, through a convenient sampling method, we enrolled a total of 120 adults in the age group of 18-55 years from Goa, India, having siblings. Further, we divided the sample as per sibling dyad, i.e. same-sex siblings (sister-sister or brother-brother) and opposite-sex siblings (sister-brother or brother-sister). The tools used for data collection included the lifespan sibling relationship scale (Riggio, 2000) and the Warwick- Edinburgh mental well-being scale (Scottish Executive National Programme, 2006). We used Karl Pearson’s Product Moment Correlation to study the relationship between the quality of sibling relationship and the psychological well-being and an independent sample t-test to examine significant differences as a function of sibling dyad in adults. Our results indicate a strong positive correlation between sibling relationship quality and psychological well-being in adults. We also observed significant differences in the quality of sibling relationship and psychological well-being as a function of sibling dyad. Keywords: Adults, Sibling Relationship, Psychological Well-being, Sibling Dyad 1. Introduction A vast majority of research in the field developmental psychology shows that siblings influence each other’s development throughout their early childhood, middle childhood, adolescence and later life of an individual (e.g., Cicirelli, 1995; Dunn & Plomin, 1991; McHale & Gamble, 1989; McHale et al., 2001); however not much is known about the sibling relationships during adulthood (Scharf, Shulman, & Avigad-Spitz, 2005). Sibling relationships are a refuge to young people to learn and grow in their own abilities and social skills (McHale, Kim, & Whiteman, 2006; Smith & Hart, 2002). Siblings early in life act as confidantes and sources of expressive support (Lamb & Sutton-Smith, 2014), and serve as agents of socialization (Slomkowski et al., 2005). Adulthood is a period in human life in which complete physical and intellectual maturity is attained. Even more so than in infancy and childhood, evidence indicates that cognitive development in adulthood is amusing, complex, and energetic, many factors collectively produce a systematic and dynamic variation (Yeh & Lempers, 2004). Adulthood has three phases, namely: early adulthood is between the ages of 18 to 35 years, middle adulthood is between the ages of 35 and 65 and late adulthood is 65+ years. Career, a good physical and mental wellbeing, marriage and starting a family, or potentially monetary autonomy coming about because of money related achievement are a part of early adulthood. The middle adulthood fetches superior financial safety for an individual, good emotional maturity and satisfaction from family growth are also prevalent during middle adulthood, but during this phase, health may become an issue for many individuals. During late adulthood, one’s physical growth starts to deteriorate, however for many individuals mentally there is likely to be a settling feeling and more peace of mind.