If he was born in Kenya (it is possible and there is a very plausible reason for Ann to have gone there) they would want to make sure he was a US citizen.
Also, as other posters have pointed out...they might want to shore up information to keep the Black Daddy from taking away the child later. Although, if they were actually married (illegally) then Grandma Whitey already had the goods on Daddy Sr for breaking the law - except he might have dragged Ann down with him.
Too bad the Obamunist got to Grandma Whitey's diaries before anybody else did.
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