From allAfrica.com
Kenya: Special Report: Sleepy Little Village Where Obama Traces His Own Roots
this is an article from 2004. Here's a quote from the last 4 paragraphs of the article...
According to the family, Obama's father travelled to America to study at the University of Hawaii in 1959. While there, he worked for an oil company and married his second wife, a white woman, named Anna Toot, and their union produced Barack Obama Jr.
Obama's book says Obama Snr left his family in Hawaii after winning a scholarship to study in Harvard when his son was two years old.
The marriage later broke up after Anna's father opposed it, according to Mama Sarah.
"Anna's father was furious about the marriage and threatened to have Obama Snr expelled from the university. Our son sent us letters, pleading that we intervene to save the marriage," remembers Sarah.