Psalm 113:9 Psalm 127:3 Genesis 25:21 1 Samuel 1:19,20 Genesis 30:22 It is GOD who opens or closes the womb, would GOD open the womb for the birth of demon children ? GOD is the creator of all spirits, angelic or human, and has established that in the physical realm each life form reproduces after its own kind. Why did GOD punish humanity for the acts of demons with a flood if it was demons who took wives of the children of humanity ? Before the universe was there were angels. We do not know the number of them but whatever that number was remains the same today as there is no biblical record of GOD creating more angles . There is no record of angels procreating with other angels. Angels cannot of themselves assume physical form but GOD must do this to angels. Abnormal height is no indication of having a demon father. A genetic anomaly caused by inbreeding is more likely. These giants likely came from Cain before the flood and Hams descendants after the flood . Moses, in the book, Leviticus 18:6, ended incest for Israel but it continues in the world to this day. Egyptian mummies of royal families practicing incest produced taller than average men but shorter than average women (Healthline.com). This incest gene travels from generation to generation and when combined with others of the same gene may produce extremely tall people.