International Journal of Innovative Research in Health Science

Background: Sibling rivalry is a common developmental phenomenon arising from changes in family dynamics following the birth of a sibling. It often manifests as jealousy, insecurity, and competition for parental attention, potentially leading to behavioral issues in children. Aim: This study aimed to assess the effectiveness of a self-instructional module on knowledge regarding sibling rivalry among mothers of under-five children in a rural area of Dharmapuri. Methods: A pre-experimental one-group pretest–posttest design was adopted. The study included 50 mothers selected through purposive sampling. Data were collected using a structured questionnaire, and a self-instructional module was administered as the intervention. Reliability of the tool was established (r = 0.89). The posttest was conducted after seven days. Data were analyzed using descriptive statistics, paired t-test, and chi-square test. Results: Results revealed a significant improvement in knowledge scores, with the posttest mean higher than the pretest mean (t = 6.8, p < 0.05). Domain-wise analysis indicated higher knowledge in breastfeeding and immunization, while lower scores were noted in cord care and thermal care. Significant associations were found between knowledge and education and parity, whereas age showed no association. Conclusion: The study concludes that the self-instructional module was effective in improving maternal knowledge regarding sibling rivalry. Educational interventions can promote better parenting practices and support healthy sibling relationships.