... and read my reply to you again. Please show me where marriage enters into any remotely recognized definition of natural-born citizen. I’ve never seen it, all reference is to “parent.” Obama, Sr. is legally recognized as father. That establishes paternity legally, and it establishes birth status as far as being a natural-born citizen, or not. He clearly was not on this basis.
Obama, Sr. was not even a resident alien, he never had any intention of becoming a US citizen, and didn’t. His own mother expatriated, marrying two foreign nationals from nations that did not recognize dual citizenship. Obama very well could have been raised by no one with any sense of American-ness about them at all, and no legal ties to the nation at all.
Citizenship follows the condition of the father. Wives’s citizenship was derivative of the husband in the United States as recently as the twenties, and still is in much of the world.