I've heard rumors that his father might be Frank Marshall Davis, but dismissed it as malicious, idle speculation. What is this about his mother?
Nobody has any clue about who this guy’s mother OR father might have been.
Just a story...without any corroborating facts...and documentation demonstrating there aren’t any such facts when here *had* to be.
Utterly irrelevant.
A Natural Born Citizen...capital N, capital B, can only derive from one source when there is no legal definition that can be applied:
Natural Law.
You keep saying “citizen at birth” as if it means something. Congress has the power to Naturalize citizens. It doesn’t have the power to make anyone who is already a citizen into a citizen.
Because it has the power to Naturalize Citizens, it CAN and DOES Naturalize Citizens at birth, obviating them from the Naturalization processes available.