Anyone has diabetes? Is it genetic?

Anonymous
So my boyfriend got 5 brothers and sisters and are all married with kids. 2 of them have a child with diabetes, the others are all ok. So I know nothing about diabetes but I was wondering if this is a genetic thing cos of 2 of them having children diagnosed with it. My boyfriend does not know any of his family members that have diabetes, as far as he knows, no one suffers from it. When I ask him how did they got it he says that they do not know. They were not born with it, and they both got it when they had around 5/7. So all I wanted to know if this is genetic.. All I know is that they do depend on insulin.. at least one of them I know that he does.
Any ideas?
Anyone has diabetes? Is it genetic?
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