C. F. Keil and Franz Delitzsch on Jeremiah 41:10

Jer 41:10

After executing these murderous deeds, Ishmael led away into captivity all the people that still remained in Mizpah, the king’s daughters and all the people whom Nebuchadnezzar had committed to the care of Gedaliah, intending to go over with them to the Ammonites. As the object of ויּשׁבּ is very far removed through the intervention of a relative clause, the connection is resumed by ויּשׁבּם. "The king’s daughters" are not only the daughters of Zedekiah, but female members generally of the royal house, princesses, analogous to בּן־מלך, king’s son = prince, Jer 36:26; Jer 38:6.