Diabetes can be genetic, the two main type of diabetes type 1 and type 2, have genetic components to it. 

Type 1

diabetes is believed to be caused by a combination of genetic susceptibility and environmental factors. If one family member has type 1 diabetes, the risk of other family members developing it is increased, although the exact inheritance pattern is complex and not fully understood.

Type 2

diabetes also has a genetic component, with a stronger hereditary link than type 1. If you have a family history of type 2 diabetes, you are at a higher risk of developing it yourself. However, lifestyle factors such as diet and exercise also play a significant role in the development of type 2 diabetes.

Many of the diseases are genetic but with proper lifestyle and disease management a person can relatively live a healthier life.