A new book traces Barack Obama's Kenyan family back twenty-three generations, or roughly half a millennium.  Peter Firstbrook was a documentary filmmaker for our partner, the BBC, for 25 years, is the author of "The Obamas: The Untold Story of an African Family."   Using oral testimony from family and historical documents, Firstbrook uncovered some fascinating details of the president's family, including questions about how President Obama's father died.

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