The children in The Midwich Cuckoos novel reminds me of the creepy oft-quoted passage about the birth of Noah (of Ark fame).
From the Book of Enoch or Book of Noah, depending on which source you read (I find it all a bit confusing):
Baby Noah is described as having skin as white as snow and as red as a rose. His hair is white and like wool and his eyes glow like the sun.
His disturbed father Lamech says, “I have begotten a strange son, diverse from and unlike man, and resembling the sons of the God of heaven; and his nature is different and he is not like us and his eyes are as the rays of the sun…And it seems to me that he is not sprung from me but from the angels…”
Lamech ponders whether his wife Bathenosh has been “lying with the angels”.
Some people interpret these angels as being aliens.
Other people are merely perplexed that angels are being perceived by Lamech as beings of flesh and blood with the ability to have intercourse with humans.
And some people think the passage means that the suspicious (but modest) Lamech is just shocked that he has sired a beautiful child.
As with all things, it all depends on how you look at it.
Village of the Damned