What is diabetes is it genetic thing?

Diabetes: Diabetes is a metabolic disorder characterized by high blood glucose due to Insulin not working well or inadequate in amount former is type 2 and latter type 1 diabetes type 2 is a strong inheritance but not a single gene defect and precipitated by incresed body weight type 1 generally sporadic but can show up in multiple family members.

genes plus environmt: There is a genetic influence, actually stronger with type 2 (vs type 1) diabetes. But this genetic influence is brought out by obesity and lack of exercise. Type 1 involves a susceptibility to destruction of Insulin producing cells in pancreas.