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Hebrews were the result of Abram and Sarah who were brother and sister breeding.
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Noah was a pretty good genetic choke point for us all.
That said, there are two camps: (1) she was his half-sister (different mothers) or (2)Sarai was the daughter of Iscah and Abraham’s deceased brother Haran (and thus his niece).
The express language is unclear. The oral tradition takes the position that’s she was his niece.
Icky, either way, I agree.