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What is the family tree diagram explaining how Sarah was Abraham's half sister (same father different mothers)?

She is indeed my sister, the daughter of my father, but not the daughter of my mother; and so she became my wife. - Gen 20:12

I tried googling it and I found this link which had the following diagram:

enter image description here

But that doesn't work as sister, because she's Terach's grandaughter. Abraham's niece.

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  • I guess they define sister as not just one generation down from the father. but multiple generations down. So a sister isn't just a daughter of your father, could be a grandaughter of your father. – barlop Feb 13 at 4:27
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The article by a Jesuit scholar Felix Just, S.J., PhD The Family of Abraham contains the family tree you are looking for, demonstrating how Sarai is indeed Abram's half sister from another (un-named) wife of his father, Terah:

Family tree of Abraham

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    So we don't really know which wife produced which other than that Abraham and Sarah were produced by a different one of Terach's wives? – barlop Feb 13 at 4:29
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    @barlop Correct. The Bible does not seem to have that information. – GratefulDisciple Feb 13 at 5:31

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