John Gill Commentary Genesis 29:5

"And he said unto them, Know ye Laban the son of Nahor? And they said, We know him." — Genesis 29:5 (ASV)

And he said to them, do you know Laban the son of Nahor ?
&c.] He was the son of Bethuel, and grandson of Nahor; grandsons being called the sons of their grandfather; and Nahor might be more known than Bethuel, Haran being Nahor's city, (Genesis 24:10) ; and not Bethuel his mother's father, but Laban her brother is inquired after; perhaps Bethuel was dead, and Laban was the head of the family, and well known, and it was to him he was sent: and they said, we know him ;
perfectly well; he lives in our city, and is our neighbour.