Spiritual sons of God, from the righteous line of Seth. believers in fellowship with Him through confession of the sin(s) of their federal head Adam, repentance from their own, in felowship with The Father and His Son.
Daughters of men, of the line of Cain, clinging to their unconfessed behavior, and bearing the mitochondria of that linem yielding a mixed multitude.
Filtered through the eight few that were saved out of the flood by not being baptized in it.
Angels are spirits, do not have DNA, and cannot procreate with each other or with human flesh (Heb. 1:7). Neither could The God, until He invested Himself into Human flesh, became incarnated, that is; and still did not so far.
If any scripture's plain sense is common sense, seek no other sense.
My opinion, and that of most others who are at rest with my Heavenly Father.
Hold this thought.
It appears that others find the bible's plain sense not quite adequate to get the job done; but can't explain why.
This makes NO sense to me.