What is the family tree diagram explaining how Sarah was Abraham's half sister?

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](https://stone-kingdom.net/index.php?cID=398) which had the following diagram: But that doesn't work as sister, because she's Terach's grandaughter. Abraham's niece.