Jehosheba ... sister of Ahaziah - “Half-sister,” according to Josephus - daughter of Joram, not by Athaliah, but by another wife. She was married to Jehoiada the high priest, and was thus in a position to save and conceal her nephew, Joash, who was only one year old (compare 2 Kings 11:3, 2 Kings 11:21).
In the bedchamber - literally, “in the chamber of mattresses” - probabIy a store-room in the palace in which mattresses were kept.