Seventy sons - i. e., descendants; there were included among them children of Jehoram (2 Kings 10:2-3, etc.).
Related Commentaries of 2 Kings 10:1
2 Kings 10:1
1 And Ahab had seventy sons in Samaria. And Jehu wrote letters, and sent to Samaria, unto the rulers of Jezreel, to the elders, and to them that brought up Ahab's children, saying,