mgdzkm433,
Did you father have diabetes when he was a boy? That's how you tell if it was "juvenile-onset" or "type 1" or "insulin dependent" diabetes mellitus. If he did, then lost his ability to make insulin, then I'm unsure if that really happens medically. Rather in the case of your grandfather and aunt, they have too much blood glucose and don't make enough insulin to handle the load...
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