Diabetes is a source of stress for patients of all ages, but particularly during adolescence. The transition into adolescence is frequently marked by declines in adherence and metabolic control due to decreased parental responsibility for diabetes care. Many factors affect parents' ability to deliver diabetic care including: knowledge, parental self-efficacy and parental style. The aim of the study was to find the correlation of parenting style, parents' self-efficacy and adherence with glucose level among early adolescents with type I diabetes through an interview questionnaire and the impact of an intervention program on those determinants. Results showed that 40.5% of parents had authoritative style, 39.7% had authoritarian style and 19.8% had permissive style. There was a positive correlation of adherence and metabolic control with knowledge, self-efficacy and authoritative behaviors of parents. Following the intervention, there was improvement in knowledge, self-efficacy, authoritative behaviors and adherence and no significant effect on metabolic control.