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 @genevareformer

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 @wholebiblehenry

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 @doctorgill

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...