... diabetes in first-degree relatives may be associated with the risk of a woman developing gestational diabetes.
... The greatest risk was conferred by having a sibling with diabetes. Indeed, women who had a sibling with a history of diabetes were at much greater risk of gestational diabetes than were women whose parents (either or both) had a history of diabetes.
... adjustment for body mass index attenuated the link between paternal diabetes and gestational diabetes but did not affect the association between maternal diabetes and gestational diabetes.
... having a sibling with diabetes “may be a greater risk factor than previously documented” ...