Jamieson, Fausset and Brown on 2 Kings 10:13-14

13-14. We are the brethren of Ahaziah--that is, not full, but step-brothers, sons of Jehoram by various concubines. Ignorant of the revolution that had taken place, they were travelling to Samaria on a visit to their royal relatives of Israel, when they were seized and put to death, because of the apprehension that they might probably stimulate and strengthen the party that still remained faithful in their allegiance to Ahab's dynasty.

children of the queen--that is, of the queen mother, or regent, Jezebel.