That dark child isn't Mark, and the lighter child is zero, so the dark child was born a few months before zero, in 1961.
Obama Sr. married schoolteacher, Ruth Baker, five months after his divorce to Ann Dunham, the mother of President Obama. The relationship produced two sons, Mark Okoth Obama (1965) and David Opiya Obama (1967-1987). The couple filed for divorce in 1973, and Ruth remarried a year later to Tanzanian businessman, Ndesandjo, and the two boys took his name. Mark, who holds a BSc (Physics) from Brown, an MSc (Physics) from Stanford and an MBA from Emory, runs a China-based internet consulting firm. His brother, David, died tragically in a motorcycle accident in 1987.
http://2012.presidential-candidates.org/Obama/Siblings.php
So for anyone still following this, Mark was born in 1965, the family group photograph shows Ruth holding Mark as a toddler, the dark boy who was photographed sitting next to zero, was born in 1961, so that same dark boy was FIVE years old in that family group image.
There’s no room for a ‘David’ in any of this story. ‘David’ is just the name they gave to the dark child whom Mary babysat in January 1961. And when you figure it out, you’ll have had the same epiphany we did. The light will eventaully go on.
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Obama has half-siblings from his father’s first and third marriages in Africa .
Malik Obama (half-brother ) (b 1958)
Auma Obama (half-sister b 1960)
Abo Obama (maybe adopted half-brother b 1968)
Bernard Obama (maybe adopted half-brother b 1970)
Mark Ndesandjo ) half-brother by father’s third wife b c.1965
David Ndesandjo (1967-1987) half-brother by father’s third wife,
George Hussein Onyango Obama ( illegitimate half-brother, b c 1982)
http://wiki.answers.com/Q/Who_are_Barack_Obama’s_siblings
That dark child isn't Mark, and the lighter child is zero, so the dark child was born a few months before zero, in 1961.