Hi Rob.
When we decided to have our daughter 17 yrs ago, passing on diabetes was something I was aware of so I spoke to the people in the know and there was such a small % higher risk than if I didn't have diabetes. You didn't say how old you son is? I was 10 when I was diagnosed and it was water of a ducks back for me as like your son I had loving parents and being a parent now I realise how much harder it was for them than me and look at how much diabetes has come on since we were kids, it will be so much easier these days than what our parents went through.
At least Diabetes can be controlled even if it can be a real challenge, the last few years I've watched one of my daughter's friends have a really hard time in hospitals all over the country trying to deal with her asthma and miss out on a huge amount of her education and social time with friends. It isn't impossible but very rare for that to be the case with diabetes. My Diabetes has certainly made me a stronger person, ive grown up multi tasking as we are always wondering what our sugars are doing!! Diabetes runs in both my parents blood lines but ive never once thought of them as responsible, although to be fair I know my mum struggled and used to tell me as a child she wished it was her and not me so I think your guilt is very natural!
Best wishes for your son, sounds like he is taking in his stride, be the proud dad you should be!