Diabetes is one of the most expanded chronic diseases. Adequately controlled diabetes is essential to maintain patient’s health. Incurableness of the disease and constant care during the patient’s lifetime can influence on quality of his and the life of his family. The treatment of diabetes is very complex and it requires patient’s full involvement and cooperation. The family has huge role in treatment in terms of help and support. The patient is equipped with knowledge from the field of health education in order to keep a record of their illness independently and improve the quality of their life. The purpose of this research was to look into the life quality of children with diabetes type 1 and their families and to detect changes caused by diabetes. The theoretical part is a nutshell summarizes the basic facts on diabetes, furthermore describes the quality of life, possible complications, the impact of changes on the life quality of diabetic patients and family involvement in the process of treatment. The empirical part of this paper contains information which were collected through online research on the life quality of children with diabetes type 1 and their family, which included the parents of the children. In the research part of thesis, results were in oppositions to our expectations, that quality of life of the majority of patients with diabetes wasn't significantly decreased. The changes that are the most frequent for patients are most observable in the field of nutrition, since diabetics have to change their eating habits drastically, while they, at the same time struggle with injecting themselves with insulin and regularly testing their blood sugar. Most parents accepted their child’s disease as a part of the everyday life and they quickly reconciled with it. However, some other parents describe, that the disease brought about large changes in their life.