'Sister' in the Bible

Jehoshabeath, the king’s daughter, rescued Joash son of Ahaziah from the king’s sons who were being killed and put him and the one who nursed him in a bedroom. Now Jehoshabeath was the daughter of King Jehoram and the wife of Jehoiada the priest. Since she was Ahaziah’s sister, she hid Joash from Athaliah so that she did not kill him.