Um, I already explained that David and Solomon ruled before the nation split in two, and they were father and son, not great-grandfather and great-grandson. Esther was a queen, and Ruth wasn’t even royalty. I could understand guessing Jehoshaphat though. But none of this matters, because you knew it was Hezekiah and Josiah. No worries.
You also know that the guy in between, being Hezekiah’s son and Josiah’s granddaddy, was the worst king of the south, with his wickedness being the key reason God gave the nation to the Babylonians. This monster even made one of his own sons a burnt sacrifice to a false god! Obviously, this wasn’t Josiah’s dad that was killed, but even so, that was bad! Who is this wicked king?