Adolescence is a critical period for self-esteem and identity development, both of which are shaped significantly by parenting behaviours. Maternal narcissism, characterised by self-centredness, emotional insensitivity, and conditional regards may disrupt this developmental process. This mixed methods study examines how maternal narcissism impacts children’s self-esteem and identity formation. Using validated instruments (Maternal narcissism inventory-adapted, Rosenberg self-esteem scale, and Erickson identity status interview adapted into a questionnaire) the quantitative strand surveyed 120 adolescents (age 13-18). The qualitative strand conducted semi structured interview with 12 purposively sampled adolescents who scored high on the maternal narcissism scale. Quantitative analysis used descriptive statistics, Pearson correlation, multiple regression and ANOVA. Thematic analysis was used for qualitative interviews. Result indicated a statistically significant negative relationship between maternal narcissism and child self-esteem (r -0.52, p<0.001) and a significant association with delayed or diffused identity statuses. Qualitative themes included emotional invalidation, role reversal, condition self-worth and identity confusion. The study concluded that maternal narcissism is associated with lower self-esteem and disrupted identity formation, and offers clinical and educational recommendations.