The Bible, Annotated

And Terah took Abram his son, and Lot the son of Haran his son’s son, and Sarai his daughter in law, his son Abram’s wife; and they went forth with them from Ur of the Chaldees, to go into the land of Canaan; and they came unto Haran, and dwelt there.

Despite how it might sound here, Lot was not Terah’s son Haran’s son’s son, but rather Terah’s son’s son, the confusion arising from the fact that ancient Hebrew didn’t have parenthesis and they were still figuring out commas, making “the son of Haran (his son’s) son” indistinguishable from “the son of haran, his son’s son,” and the word “grandson” was largely derided as “unpoetic.”