2CH 22:11

11 But Jehoshabeath, daughter of King Jehoram, grabbed Joash, son of Ahaziah, and took him from the sons of the king who were about to be killed, and she placed him and his nurse in a bedroom. Because Jehoshabeath, the daughter of King Jehoram and the wife of Jehoiada the priest, was Ahaziah's sister, she hid Joash from Athaliah so she couldn't kill him.