The Jewish War 6.356–357 (Whiston VI.6.4) — William Whiston (1737), public domain (Perseus digital edition, CC BY-SA 3.0 for the digitisation) (public domain)
On the same day it was that the sons and brethren of Izates the king, together with many others of the eminent men of the populace, got together there, and besought Caesar to give them his right hand for their security; upon which, though he was very angry at all that were now remaining, yet did he not lay aside his old moderation, but received these men. At that time, indeed, he kept them all in custody, but still bound the king's sons and kinsmen, and led them with him to Rome, in order to make them hostages for their country's fidelity to the Romans.
Reproduced in full. Translation: William Whiston (1737), public domain (Perseus digital edition, CC BY-SA 3.0 for the digitisation) (Public domain).
Why Pitre cites it
The sons and 'brothers' of King Izates: Josephus uses adelphoi and syngeneis, 'brothers' and 'relatives,' as synonyms in one passage — Pitre's third witness that 'brothers' can mean kin.
Notes
Whiston renders adelphoi as 'brethren' ('the sons and brethren of Izates the king') and later 'the king's sons and kinsmen'. Whole of VI.6.4 given.