Diabetes Screening?

Gabriel and I are both at really high risk for both types of diabetes. Lately, he's been exhibiting some symptoms--peeing every 5 minutes, fruity breath, grouchy--and I'm thinking he should have another screening. He got a lot of screening as a newborn, because he weighed 9lbs 6oz at birth, and my glucose had gotten a bit out of control during pregnancy. He had a fingerstick at a WIC appointment in January, it was too high, so we went to the pediatrician for the A1C, which checks the average blood sugar for the past 2? months. That test was normal, but here he is with the symptoms again.

My mother, her father, two of her sisters, and her brother all have/had type 2.

My father, his mother, three of his brothers, his grandfather, and his sister all have/had type 1.

I discussed it with his pediatrician when he had the A1C, she says that I need to lose weight, but with the history of adult onset type 1, I still wouldn't be completely protected. She also said that Gabriel's fine--but he's always been way above the 99th percentile on both height and weight, I worry about that. Right now, he's almost 2 1/2, is 39 inches tall and weighs 42 pounds.

I just feel so frustrated with this, like our bodies are set to self-destruct. I really want to change our lifestyles, but it doesn't seem like that will be possible until we have our own place.