Welllllll, that might explain a few things. For the last few years, when asked about any diabetic history in my family, I always said, truthfully, "Everybody." Which was followed by "Okay," and nothing more was said or done.
I am overweight, but not obese. When I was obese (the first in my all-diabetic family to reach that landmark, by the way), I was only about 15 pounds over the border. That probably put me in the low-risk category ... which, going by symptoms, lasted through at least a few years of full-on, undiagnosed diabetes.
In fact, I was told to watch my cholesterol, and
not to worry about added sugar in low-fat versions of foods, or in anything at all!

(Back then, I simply hated the taste of the unreal stuff, and steered clear of it anyway.)
Oh, and when my numbers were supposedly "perfect," I neglected to keep track of them. Now I wonder how good they actually were.