Note the alignment of the underlined words in the following verses discussing Jacob's sons, coming down to buy food in Egypt:
• And Joseph’s ten brothers went down to buy grain in Egypt. ....
• And the sons of Israel came to buy grain among those who came; ...
• and Joseph’s brothers came, and bowed down before him with their faces to the earth.

Note the deliberate shifting of description of the Jews: Jacob's sons vs Joseph's brothers. Rashi comments We hear the emphasis: They were not only Jacob's sons; they were also Joseph's brothers. They had repented; they no longer wished Joseph dead. They realized they made a mistake selling him. Rashi further elaborates with reasonable fill-ins. They told Joseph, whom they did not recognize, that they were searching for their lost brother and wanted him back.

Sermonic points: The above Rashi studies the violent emotion of anger and rage. Very often anger/rage is momentary. True, Joseph's brothers were angry at him and wanted to kill him or sold as a slave. But time healed this anger. They now wanted him back. We are all familiar with this change from anger and see it frequently in our daily lives.