Yup, but the Mau Mau were Kikuyu and Obama's family is Luo.
They don't get along.
In 1958, Obama Senior was awarded an American sponsored scholarship in economics to the University of Hawaii at Manoa. He was selected by a former Kenyan cabinet minister, the late Tom Mboya, who was earmarked as the successor to Jomo Kenyatta, Kenya’s first prime minister and leader of the terrorist Mau Mau.
http://www.theobamafile.com/ObamaFamily.htm