My husband is t1, his father and grandmother were both t1s
In my family my dad was diagnosed t2, never overweight, very active, very healthy diet turned out to be LADA, Other members on his side going back decades where late onset t1.
Now it's my turn diagnosed t2 at 44, 4 years later on insulin and lchf diet, awaiting GADS test etc. My bg was 18.3 with ketone level of 2.1, 3 weeks ago, they now think I'm t1.