Blood relationship is a key component of U.S. citizenship law.
It is well established international law going back to the founders that the child of a legally single mother has only the unitary citizenship of the mother. I believe that this is why Barry is suddenly claiming to be a bastard in the very week that this case comes up in GA.
Only a child of a legitimate (non-bigamous) marriage becomes a UK subject at birth regardless of “blood relationship” and without UK citizenship at birth Barry is not a dual citizen, thus much more likely to be considered NBC, IMO (only SCOTUS could decide).
See my comments #289 and #316