“Unlike my mum, Ruth has all the documents needed to prove who Mark’s father was”
It was Obama’s older sister, Auma who said that referring to her “mum,” Kezia. Kenya being a former Brit colony, mum would be a word for mom for Auma and not normally a word that mostly US raised Obama would have used.
Here is the passage from Dreams posted by FReeper thouworm in comment #28 of this thread:
http://www.freerepublic.com/focus/f-news/2377996/posts
(Obama narrating)
When I got home, told Auma how the meeting had gone. She looked away for a moment, then broke out with a short, bitter laugh.
“What’s so funny?”
“I was just thinking about how life is so strange. You know, as soon as the Old Man died, the lawyers contacted all those who might have a claim to the inheritance. Unlike my mum, Ruth has all the documents needed to prove who Mark’s father was. So of all of the Old Man’s kids, Mark’s claim is the only one that’s uncontested.”
Again Auma laughed, and I looked up at the picture hanging on her wall, the same picture pasted inside Ruth’s album, of three brothers and a sister, smiling sweetly for the camera.
It is irrelevant whether Obama attributes the utterance to Auma. In his book Obama is stating that his mother did not have any documents needed to prove who his father is.
Obama owns the narrative.