Bereshit 20:12-Avraham and Sarah
Gen 20:12 Abraham says Sarah is my sister, the daughter of my father (i.e., Terah), but not the daughter of my mother.
Assuming Sarah was Iscah, Abraham married Sarah (Iscah),
the daughter of his brother Haran. Therefore, Sarah was Abraham’s niece.
Question: What does “Sarah is not the daughter of my mother” mean?
It seems to imply that Abraham’s father (Terah) had two different wives – one was the mother of Abraham, one was the mother of Haran, and one of them was also Nahor’s mother.
Also, does the bible provide the names of these wives?