7. Are my brothers and sisters and my children at risk of diabetes?
If you have type 1 diabetes, your first-degree relatives (i.e. mother, father, brother, sister, and your children) are about ten times more likely than the general population to get type 1 diabetes. The frequency of type 1 diabetes in the general population is about half a percent (i.e., one in two hundred), so the risk in your first-degree relatives is about 10 1/2, or 5%.
Fortunately, this is not particularly high. Also, it is related to age. About 90% of cases of type 1 diabetes occur before age 35. Therefore, the parents of a person with type 1 diabetes are at considerably less, and ever decreasing, risk compared to his or her siblings and children.