Family History: If you have a so-called first-degree relative (sibling, mother, or father), with bd your genetic "loading" for bd is higher than if you don't. However, lots of people have bd with no known family history; and, even if both your mother and father have bd, the risk that you will too still is only about 20%--way higher than the general population but not a sure thing.
Answered 11/28/2017
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