Hi, I also have the same question to ask. My father is suffering from type-2 Diabetes since 3 years.
Type 1 diabetes is an autoimmune desease. You may want to talk to a genetics specialist and your doctor since several factors may be involved such as whether you have a history of diabetes in your family, etc. I was the only type 1 diabetic in my family. However, my father and my mother had type 2.