For the tribe of Yosef, for the tribe of Menashe, Gaddi son of Sussi (13:11) When the Torah mentions the tribes of Menashe and Ephraim, the children of Yosef, it sometimes mentions Yosef in connection with one (for example above) and sometimes in connection with the other (e.g., Bamidbar 1:32). R' Shimon Schwab z"l (1908-1995) explains: When Yaakov blessed Yosef, he said (Bereishit 48:5-6), "Your two sons who were born to you in Egypt before my coming to you in Egypt shall be mine; Ephraim and Menashe, like Reuven and Shimon they will be to me. But progeny born to you after them shall be yours; they will be included under the names of their brothers ... It is these other children to whom the Torah refers when it mentions the "the tribe of Yosef" or "the sons of Yosef." For whatever reasons, they are sometimes counted among the sons of Menashe and sometimes among the sons of Ephraim. (Ma'ayan Bais Ha'sho'eivah)
