I don’t have it, but my husband has the hereditary type. He started weeing more often, so knowing that his father, sister and niece all have it I persuaded him to go to the GP and ask for a test, which was positive.
Hereditary diabetes is not widely understood - armchair experts often claim it must have been caused by lifestyle factors, which it wasn’t. It is important to get a diagnosis sooner rather than later, to get in the loop for eyesight checks, foot care and so on. My FIL was registered blind before he died, as he wasn’t diagnosed until too late. My husband gets annual checks and it is well controlled.