It's what's called a complex polygenic disorder. It's a big term, but it means that multiple genes from both the mom and the dad are risk factors for both type 1 and type 2 diabetes. Lots of excellent researchers around the world, including the group from Montreal Children's Hospital, are doing this kind of work in large populations to identify genetic susceptibility. So it's not from one side or the other, per se. It's not X-linked through the father.
On November 27th, 2012. See this statement in context.