Musar do Rodzaju 37:8

(Ibid. 5): "And Joseph dreamed a dream… (8) …Will you reign over us?": Scripture expatiates upon the dreams to rationalize somewhat the extreme hatred of the brothers to Joseph to the point of wanting to remove him from the world: They assumed that he desired to reign over them, for which reason he had brought "evil report" of them to their father, so that he should remove them from his presence [as Rashi explains (Ibid.): "for his dreams and for his words" — "for the evil report that he had brought to their father." And the robe that his father made him served as "supporting evidence" that he had accepted his report], and that perhaps, G-d forbid, he would agree with Joseph, so that he [Joseph] would be a "master" over them, as in Isaac's blessing to Jacob (Ibid. 27:29): "Be a master to you brothers, and your mother's sons will bow down to you." Or, [they thought,] G-d forbid, that he [Jacob] would banish them altogether, as Noach said (Ibid. 9:25): "Cursed is Canaan; a servant of servants shall he be to his brothers." Therefore, they took counsel on how to rid themselves of him.