I add :
to this:

You laugh, and when I was a child, when I read the Bible, I sincerely thought before eight or nine years that men were giving birth. Then God had mercy on them.

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And I don’t understand how Adam and Eve could have had grandchildren if there wasn’t incest.

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It becomes even more incomprehensible considering that Adam and Eve had only sons. If you read the Bible, you may not be so wrong.