My mother is diabetic and even I have high sugar levels. Will my son, who is a little plump, in the risk group for diabetes too?

As far as I know, diabetic is inherited genetically but crossing gender. A dad will only pass it to his daughter and a mom will only pass it to her son. Nowadays, even someone without any genetic inheritance can still from diabetic if he/she doesn't take care of his/her daily sugar intake and doesn't perform a healthy lifestyle -exercise, balanced diet. Even if you're boy is still a little plump, you can help him to be healthy and avoid diabetic by giving him the balanced diet he needs and encourage him to exercise (play sport, swim, and such). I wish you and your family to be healthy always! :)