Careful judgement[1]
ויאמר אליהם אל תרגזו בדרך
…[Yosef] said to [his brothers]: “Do not quarrel on the road”[2]
After Yosef revealed to his brothers that he was now the viceroy of Egypt, he requested they bring their father from the land of Canaan. The seven-year famine was still ongoing, and their family was starving. Yosef had secured enough food to last through the famine, and was offering his family safe haven in Egypt. Before they departed on their journey, Yosef warned them against quarreling on the road. The simple meaning of the verse[3] is that Yosef was concerned that his brothers would discuss their sale of Yosef as a slave. Now that Yosef was in a position of power, and he was their savior, they might argue about whose fault it was that Yosef was sold. This discord could prove dangerous on their long journey home. He therefore cautioned them against discussing such matters.