I'm just curious to know how many of you have a parent/sibling/child with T1 as well as yourselves. My son's T1 came completely out of the blue as there is no history on either sides of our family, but I have read the statistics that suggest his sister has a 1 in 6 chance of developing it too (she is 5 years older). I just wonder if it really is that common in siblings, and how likely would my son be to pass it on to any children he should have in the future? Thanks.