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Bipolar disorder affects between 1-1.6% of the population of the United States, but, unfortunately, it does run in families as it is known to be, at least partially, passed down through genetics. There is no data specifically on siblings but it is known that first-degree relatives, in general (which siblings would be), of people with bipolar I disorder have a seven times greater chance of having bipolar I than the general population.

In identical twins, studies have found a concordance rate of between 33-90% in bipolar I.

Additionally, offspring of a parent with bipolar disorder have about a 50% chance of having another major psychiatric illness.

Reference: Medscape Reference: http://emedicine.medscape.com/article/286342-overview#showall

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Q: What are chances of two siblings being bipolar?
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