[Fred Nerks]

...Dunham had died seven years earlier, but Obama hadn't sorted through all her things. Now, alone in his old house for just the third night since he'd become president, he started rummaging through the boxes, digging, digging, until suddenly he found it: a small, four-paneled paper booklet the world had never seen before. On the front was an ink drawing of Kapi'olani Maternity and Gynecological Hospital, in Honolulu. On the back was a picture of a Hawaiian queen. On one inside page were his name, his mother's name, and his date of birth; on the other were his infant footprints...

If he found anything, which is doubtful, what he might have found is the hospital record of the child born Barack Hussein Obama 11 in January 1961, the name of the mother would have been Ann or Anna Obama (maiden name unknown), and the father was the Kenyan student after whom that child was named; the man who insisted on being recorded as being KENYAN because he wasn't about to tolerate being described as Negro.

If there are footprints, they belong to the child Mary babysat in early 1961, when her own daughter, who was born in July 1959, was 18 months of age.

So who is he?

[Nero Germanicus]

That’s a great theory. If only there was proof to back it up in a court of law or before a congressional investigative committee.
There are photos of the souvenir birth certificate that Obama supposedly found in the book: Double Down: Game Change 2012.