Not the only sibling with diabetes

Well I'm not the only son with Diabetes in my Family, My older brother has it too. Well my question is if any of you Juvenators kno any family or are in a family where 2 of the siblings have T1...and the diffrence of age when they were dx with it. For example...MY brother was dx his 7th grade year in May, I was diagnosed 6th grade year in March. Thx :)