Matthew Poole and continuators on 2 Kings 11:2

2 But Jehosheba the daughter of king Joram sister of Ahaziah, took Joash the son of Ahaziah , and stole him from among the kings sons which were slain ; and they hid him, even him and his nurse in the bed chamber , from Athaliah, so that he was not slain.

Called Iehoshabeath, 2 Chron. 22. 11.

To wit, by another Wife, and not by this Athaliah: for it is not likely Iehoiadah who Married her, 2 Chron 22. 11. would have Married one of that Wicked and Cursed House, except he were Married very young, and therein over-ruled by his Parents.

Either, 1. His Adopted, and Legal Son, who was to Succeed him, though he was of another House, and of Nathan's Family, as many think: such persons being sometimes called the Sons of their Predecessors, as we shall see hereafter. Or rather, 2. His proper and Natural Son; for not onely he, but the rest who were Slain, are here called the kings (i. e. Ioram's) sons.

Either, 1. From amidst of the Carcasses, where this Infant was laid, and supposed by her to be killed, though it was not quite dead; either through the compassion, or connivence of the Instruments of this Execution; or by some other Artifice which his Nurse used. Or, 2. Out of that Apartment of the Palace which was allotted for the King's Children.

Iehosheba and her Husband Iehoiadah.

Which was in the house of the Lord; as is affirmed in the next Verse. So that it was one of those Chambers adjoyning, or near to the Temple, which were for the uses of the Priests and Levites, and for them onely: which made it more proper for this purpose.