I have to think that you misread this. It’s completely counter to the Biblical “begats” and leaves one to wonder just what sort of reproduction led to the first sons Cain and Abel, let alone the subsequent generations leading to Abrahm/Abraham.
Going into the Pseudepigraphica, there’s the first book of Enoch, the book of Jasher, etcetera, that go into detail about the fallen angels finding daughters of men attractive and desiring to produce offspring with them, something they were denied by God, but that they somehow managed to do, to the detriment of all Creation. There are hints about this in the canonical books of the Bible as well, most clearly in Genesis.
One of the primary reasons for the Biblical deluge was to wipe these literally ungodly creatures off the face of the Earth. They had committed a grave sin and had dragged all of Creation into it. That’s the reason Noah was described as being perfect in his generations. He wasn’t “contaminated” by these quasi-humans, or however you’d describe them.
It sounds very odd to those unfamiliar, like something out of a science fiction novel, but it’s there if you’re interested in reading about it.
Joseph not the natural born father of Jesus? it is mentioned in the jefferson bible..