Who is Auma Obama?

Dr. Auma Obama is a Kenyan activist, sociologist, and political campaigner. She's the half-sister of Barack Obama, the 44th president of the United States of America. Auma was born to Barack Obama Sr. (President Obama's father) and his first wife, Kezia. In Dreams from My Father, it's Auma who picks up Barack Obama from Jomo Kenyatta Airport in Nairobi when he arrives in Kenya to search for his African roots. She turns up in a battered old Volkswagen Beetle, a car model that's known locally as "The Tortoise."
Twenty-seven years later, Barack Obama returned to the airport, now as president of the United States. Upon landing, President Obama was introduced to a long line of local dignitaries, including a certain Dr. Auma Obama. After exchanging a warm embrace and some pleasantries, the president invited his half-sister for a ride in his presidential limo, nicknamed "The Beast," a far cry from "The Tortoise" in which they'd ridden together over a quarter of a century before.