Graves disease is usually passed on through genetics.
The Graves disease can be passed on through genetics such as through a persons mother or father or even really close relative.
Also if your mom or dad or someone in your family that is in close family has any autoimmune disorders then you might get the graves disease as well.
If someone in your family has graves disease then it can also increase your chance of getting graves disease.
Especially if your parents or parent such as your mother or father has or had graves disease before or during the birth and pregnancy of you then you might get the graves disease as well.
Graves disease is an autoimmune disorder and as far as we know right now it's only passed down and passed on through genetics.