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 which had the following diagram:

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