The study of cognitive development in early adolescents is crucial for understanding how various factors contribute to educational and social outcomes. This research focuses on examining the impact of parental engagement on the cognitive development of children aged 10 to 14 years. The objective of the study is to explore the correlation between the level of parental involvement and cognitive performance measures such as problem-solving, memory, and language skills. Methods involved a cross-sectional analysis of a diverse cohort from Estonia, Kenya, and Australia, utilizing standardized cognitive assessments and parental engagement questionnaires. Findings indicate that active parental engagement is positively correlated with enhanced cognitive abilities in early adolescents. Specifically, problem-solving skills and memory retention showed significant improvement in children whose parents were actively involved in their education and extra-curricular activities. The study concludes that fostering an environment of parental involvement is critical in supporting cognitive development during early adolescence, suggesting policy implications for educational frameworks to incorporate parental training and support systems. Further research is recommended to explore longitudinal impacts and the role of cultural variations in parental engagement.