Diabetes in the family...!??

My son was diagnosed with type 1 at age 15. He's 18 now. His initial symptoms were frequent urination, thirst, upset stomach, and weight loss. It changed almost every aspect of his life. He didn't deal well with it at first, but he's coming around. I didn't foresee the anger it created in him. Hell of a way to find out invincability is a myth. He says he is a human pin cushion.