Some believe the sons of God were fallen angels, but Arthur doesn’t  believe or teach that.  The sons of God were the godly men born to Seth and his descendants.  Abel, who was killed by Cain, was righteous based on the testimony of God.  Seth was a replacement for Abel according to Mrs. Adam.  Seth’s offspring begin to call on YeHoVaH. The daughters of men were the daughters of Cain.  Remember, Cain went out from the presence of God, was evil, and was of the wicked one.