sons. Put by Figure of speech Synecdoche (of Part), for grandsons and greatgrandsons.
unto. Some codices, with Septuagint, Syriac, and Vulgate, read "and unto".
rulers. elders.
of Jezreel. Doubtless they had fled to Samaria, being in great fear (2 Kings 10:4) from what Jehu had done in Jezreel.