There is no debating when man was created. There was 1 man per family and child birth. And I know u are wandering the math. Well look at man & woman as an individual person. And what each individual person contribute to each other; of life.
There is this history of the baby's father. There is this history of the baby's paternal mother. And for generations we all know the reality is found in the DNA. Of bloodlines that are inevitable of being erased.
One day we will discover our own truth inside. However, there is a possibility our questions will not be answered; from whom is laid to rest. Remember the truth will always exist in the living.
We can search our own ancestry through provided r scattered information, old pictures and blurred documentation. And we ask in confidence for the truth; of the living to direct us on different paths to find out truths in our own bloodlines. If not knowing our own family history.
In the Beginning was heaven and earth; then Mankind was given birth.