There are no others in my family who have Graves; however my endo told me that it doesn’t have to show up as Graves. For instance, my mother has rheumatoid arthritis (which is autoimmune); he said that is proof enough that autoimmune runs in the family somewhere! So possible others in your family may have a different sort of autoimmune disease. I’m with Bobbi – it could show up as so many other horrible illnesses which are so much harder to treat. My next door neighbor has Lupus and has had kidney damage from this disease and she doesn’t know what each day will bring.