Shared ground
The passage presents a sudden succession crisis in Judah. After Ahaziah’s death, Athaliah moves to secure rule by eliminating rival claimants: she “destroys all the seed royal” of Judah’s royal house (v.10). The narrative then highlights a counter-action inside the royal family: Jehoshabeath rescues Joash, removes him from the group being killed, and hides him with his nurse (v.11). Joash’s survival is not pictured as an accident but as an intentional, organized rescue.
A second shared emphasis is the role of the temple (“house of God”) as a protected space. Joash is kept hidden there for a long, defined period—six years—while Athaliah reigns (v.12). The story places royal politics, priestly connections, and the temple’s physical security on the same stage.
Where interpretation differs
Two questions draw different readings.
First, does “destroyed all the seed royal” mean Athaliah succeeded in killing every last royal heir except Joash, or does it mean she attempted a total purge but some unknown survivors could have existed? The text’s surface claim is total destruction, yet the immediate discovery of Joash alive shows at least one exception.
Second, who are “them” in “He was with them hid in the house of God” (v.12)? Some read “them” as Jehoshabeath and Jehoiada (the named couple in v.11). Others read it more broadly as the temple community or personnel who participated in concealment.
Why the disagreement exists
The Hebrew-style wording can speak in sweeping terms (“all the royal seed”) even when the story itself reveals an exception. Also, the pronoun “them” has more than one reasonable antecedent in the near context: the couple just named, or the larger group implied by long-term hiding in a guarded complex.
What this passage clearly contributes
Explicitly, it reports (1) a violent seizure of power, (2) the preservation of Joash through decisive action by Jehoshabeath, and (3) the temple as the place of long-term concealment. By implication (not stated as a direct claim), the narrative reinforces a key theme in Chronicles: the Davidic royal line faces real threats, yet it is preserved through hidden, sometimes temple-connected means, consistent with the book’s broader interest in the continuity of David’s line (1 Chronicles 17:11–14).