K.C.
Hi Stacy,
So, this will not be the most popular response you'll get. However, give it a chance. :)
I'm high risk for diabetes, my father is not doing well from complications, and my aunt is in a wheelchair and almost blind from it. I take this risk super serious. I was terrified when I read the statistics and health problems stemming from diabetes.
So, I did lots of research, and found that the best choice for me is a vegan diet. See this link; it's pretty amazing what it can do for you.
http://www.pcrm.org/magazine/gm06autumn/diabetes.html
http://www.pcrm.org/health/diabetes/pdfs/Diabetes-Care.pdf
If you don't think your folks could commit to this diet, try reducing meats and milk products....instead of meat three times a day, or twice a day drop to once every few days or so. Avoid cheese and milk...
Most people think vegan diet is crazy and only for PETA people but it has amazing health benefits.
Good luck, and best wishes to your family.