Moses
Genesis 20:12ESV·traditional attribution

Besides, she is indeed my sister, the daughter of my father though not the daughter of my mother, and she became my wife.

John Calvin Reformed

12. And yet indeed she is my sister . Some suppose Sarah to have been Abraham’s own sister, yet not by the same mothers but born from a second wife. As, however, the name sister has a wider signification among the Hebrews, I willingly adopt a different conjecture; namely, that she was his sister in the second degree; thus it will be true that they...

Matthew Henry Presbyterian

Abimelech, being thus warned of God in a dream, takes the warning, and, as one truly afraid of sin and its consequences, he rises early to obey the directions given him. I. He has a caution for his servants, Gen 20:8. Abraham himself could not be more careful than he was to command his household in this matter.

Commenting on Genesis 20:8-13

John Gill Reformed Baptist

And yet indeed she is my sister,.... In the same sense as Lot was his brother; for she was sister to Lot, and both were the children of Haran, the brother of Abraham: she is the daughter of my father, but not the daughter of my mother; she was the daughter of his father, being his granddaughter, grandchildren are sometimes called children, but not the...