In this week's Parsha, Yosef finally reveals his true identity to his brothers - and lets them know - that he is the brother that they have sold years ago.
The Torah then tells us how the brothers went back to their father - Yaakov - and after telling him that Yosef is still alive, at first, he didn't believe.
The Torah then describes how the brothers told Yaakov everything that Yosef said, and Yaakov saw the wagons Yosef sent - and then Yaakov finally believed.
What exactly was in the words that the brothers said, that made Yaakov believe?
Why were the wagons so important for getting Yaakov to believe and understand - that Yosef is really still alive!