Parental priority punishment[1]
וישלח את-אחיו וילכו ויאמר אלהם אל-תרגזו בדרך
[Yosef] sent off his brothers and they went. He said to them: “Don’t quarrel on the road”[2]
After finally revealing himself to his brothers, the long-thought dead or enslaved Yosef had reunited with his family. Yosef told them to return to Canaan to bring their father to Egypt, where there was salvation from the global famine. Before they left, Yosef cautioned them not to quarrel on the road. The simple explanation is[3] that he was telling them not to argue about whose fault it was that Yosef was sold as a slave in the first place, as Hashem had engineered everything to bring Yosef to political power.