Either they, or [[האדם]], represented the proto-human Y-chromosomes (e.g. [http://fort-fox.info/familiar-faces/ 1], [http://paleoanthropologie.blogspot.com/2010_04_01_archive.html 2], [http://en.wikipedia.org/wiki/Uranus_(mythology) 3]) which did not survive down to the present day.
If Hadam represented the proto-humans then we could say that the children of God survived the deluge thanks to Enokh and the children of Noah, whereby Noah would have had twin sons (yDE-Shem and yCT-Japheth) and an elder daughter (mtL0-Ham).
