פירוש על בראשית 37:10

ויספר אל אביו ואל אחיו AND HE TOLD IT TO HIS FATHER AND TO HIS BRETHREN — After he had related it to his brothers (see 5:9) he again related it to his father in their presence.

AND HE RELATED IT TO HIS FATHER. He told his father of this dream concerning the sun, moon and stars, but not of the first one concerning the sheaves because he himself recognized its interpretation and knew that the sun alluded to his father, and his father rebuked him.⁴⁵Ramban’s intent is to say that the father’s rebuke is proof that he knew that Joseph understood the meaning of the dream.
The meaning of the expression, And he related it to his father and to his brothers, is that he related it to them a second time,⁴⁶Since it is already stated in Verse 9 that he related this dream concerning the sun, moon and stars to his brothers, it must mean here in Verse 10 that he related it to them a second time. as he told it to his father in their presence, and his father rebuked him in order to dissipate their anger towards him.
The meaning of the expression, What is this dream that thou hast dreamed? is the same as, What is man that Thou shouldst take cognizance of him?⁴⁷Psalms 144:3. That is to say, “What is this dream? It is nothing that you should relate for it is nothing but idle talk.” Alternatively, the meaning of the rebuke may be: “How dare you dream such a dream? It is but your conceit and youth that bring up such matters in your heart,” just as it says concerning dreams, Thy thoughts came upon thy bed;⁴⁸Daniel 2:29. Here understood literally: “The thoughts you entertained during the day came with you to bed, and you dreamed about them.” And imaginings upon my bed.⁴⁹Ibid., 4:2. Understood in the same sense as above.

מה החלום הזה?, even if Joseph’s mother had still been alive, Yaakov would still have rebuked Joseph for having such a dream.