Seforno: Because they attributed Yosef's newfound haughtiness to the rise in his father's esteem for him, which was why he dared say over the dream in his father's presence.

Ohr ha'Chayim: The latter dream could not be due to his thoughts. He would not think to rule over his father! Rather, it must be a prophecy. Ha'amek Davar - Also, it received such an interpretation (that even his father would bow to him).

Malbim: His brothers saw that there is reality to the dreams. They thought that Yaakov wants to crown him over them, and give the Bechorah and Berachah to him.

Gur Aryeh: Earlier, the brothers "hated him" (37:4,5,8); but now they were "jealous" of Yosef. Upon hearing the first dream, they had thought it was false. Once the dream was repeated, they realized it was true, and they were jealous. Refer to 37:10:2.2:1 .

Rashi, Seforno, and Targum Yonasan: It means that Yaakov kept the matter in mind (waiting for it to materialize). ¹

Rashbam: Because it explains why Yaakov retained his faith in the correct interpretation of Yosef's dream, so that, when he received the wagons, sent on the express orders of the king of Egypt, he immediately understood that the dream had come true. ¹

Seforno: To teach us that he eagerly awaited the realization of the dream, even though it meant that he was destined to bow down to Yosef - because a person does not envy his son.

Moshav Zekenim: Specifically the second dream had to be from Hashem - how else could Yosef have known that Yaakov is called 'Shemesh'? ¹

Yosef did not tell the first dream to him - refer to 37:10:2.