When Abraham is accosted by Abimelech king of Gerah concerning Sarah he claims that she is his sister from his father's side
Genesis 20:12 NASB
Besides, she actually is my sister, the daughter of my father, but not the daughter of my mother; and she became my wife;
When looking at toledoths in the book of Genesis beginning with that of Nahor the father of Terah we find out that it clearly states that besides his sons there were also daughters born to him
Genesis 11:24 NASB
Nahor lived twenty-nine years, and fathered Terah; 25 and Nahor lived 119 years after he fathered Terah, and he fathered other sons and daughters.
But when we get to Terah's toledoth it is only stated that he had three sons namely Abraham,Nahor and Haran and there is no mention of any daughters
Genesis 11:26 NASB
Terah lived seventy years, and fathered Abram, Nahor, and Haran.
Even when we look further at Haran's toledoth it mentions only one son and no daughter
Genesis 11:27 NASB
Now these are the records of the generations of Terah. Terah fathered Abram, Nahor, and Haran; and Haran fathered Lot.
NB:Why I included Haran's toledoth is because some have reckoned that Sarah was actually his daughter and sister to Lot.
Why was Sarah not mentioned in either Terah or Haran's toledoth?