Arguably, if we are going to to “Biblical” at all, then all humans share a bloodline back to Adam and Eve, and then the family of Noah.
And if ya want to stay strictly secular, there HAD to be the first two genetically ‘identical’ humans who met, mated, and produced the first offspring capable of continuing the human species. Same answer.
Og and Oog. They first met and bonded while staring together at the Black Monolith.