בְּנֵ֤י רָחֵל֙ אֵ֣שֶׁת יַֽעֲקֹ֔ב יוֹסֵ֖ף וּבִנְיָמִֽן׃
야곱의 아내 라헬의 아들 곧 요셉과 베냐민이요
Rashi
בני רחל אשת יעקב THE SONS OF RACHEL, JACOB’S WIFE — In the case of all the other wives of Jacob the term אשת “wife” is not mentioned. But the reason is because she was the chief mistress of the household (Genesis Rabbah 73:1).
Sforno
בני רחל אשת יעקב, who had been the wife whom he had wanted to marry. She had also become the mother of Joseph and Binyamin, the choicest of the tribes as mentioned by our sages in Sotah 36. The text there is: “Joseph by himself was worthy enough to have produced 12 tribes just as his father Yaakov.” The same sages, in Shabbat 55 are on record as saying that Binyamin died only because death had ben decreed for every member of the human race.” [not because he had committed any personal sin which would have accounted for his forfeiting eternal life. Ed.]
Tze'enah Ure'enah
“The sons of Jacob’s wife Rachel” [46:19]. It does not say about any of the wives that she was the wife of Jacob, but only for Rachel does it say that she was the wife of Jacob. The explanation is, because Jacob loved Rachel very much, more than the other wives.61Rashi, Genesis, 46:19.