Excellent summary, Ali.
I don't know what type dad was, probably T2. He was diagnosed in 1962 or there about, and died in the mid eighties. I think he was on insulin the last years of his life, but I left home in 1979 so can´t be sure. He probably would have benefited from insulin earlier. Seeing what diabetes did to him has me very scared of this disease. He was only 72 when he died after being severely ill for some years.
Mum is diabetic too, but that may be due to her being on Prednisolone, but I think her diabetes started before the steroids. Apart from diabetes she has pernicious anaemia, asthma and psoriasis and a lot of other things I won´t bore you with, she is 92 and frail. And I am hypothyroid, so there is autoimmunity in the family.