As these were of the family of Ahab, no doubt they were partakers of his idolatry, and justly therefore involved in the punishment.
Related Commentaries of 2 Kings 10:12
2 Kings 10:12-14
12 And he arose and departed, and came to Samaria. And as he was at the shearingd house in the way,
13 Jehu met with the brethren of Ahaziah king of Judah, and said, Who are ye? And they answered, We are the brethren of Ahaziah; and we go down to salutee the children of the king and the children of the queen.
14 And he said, Take them alive. And they took them alive, and slew them at the pit of the shearing house, even two and forty men; neither left he any of them.