Diabetes in the family...!??

It runs in my family. However my uncle has been in a few study groups and has been able to keep from getting it by diet and exercise. He is almost 70 and does not have it yet, where my mom and half brother has it. One bad thing about if you get it, you can't have as many deserts as you used to. But my neice is learning how to cook for people with diabetes with experimenting with recipies with Splenda.