Sons, and sons’ sons - This genealogy of the house of Saul appears by the number of the generations to belong probably to the time of Hezekiah (compare 1 Chronicles 4:41). Ulam’s “sons’ sons” are in the 13th generation from Jonathan, as Hezekiah is in the 13th generation from David.
Related Commentaries of 1 Chronicles 8:40
1 Chronicles 8:40
40 And the sons of Ulam were mighty men of valour, archers, and had many sons, and sons' sons, an hundred and fifty. All these are of the sons of Benjamin.