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Ephraim was...."the son of Joseph by his wife Asenath, the daughter of Potiphera the priest of On. Ephraim, the younger brother of Manasseh, was born in Egypt before the seven-year famine began. The name Ephraim was given to him by his father “because, to quote [Joseph], ‘God has made me fruitful in the land of my wretchedness.’”—Ge 41:50-52
On his deathbed, Jacob, in effect, adopted his grandsons Ephraim and Manasseh and appointed them to be the equals of his direct sons. (Ge 48:5
) Their father Joseph, who received the right as firstborn among Jacob’s sons, received two parts of his father’s inheritance by means of the tribal inheritance of Ephraim and Manasseh. (1Ch 5:1
; compare Ge 48:21, 22; De 21:17; Jos 14:4
.) In blessing Ephraim and Manasseh, the patriarch Jacob gave the preference to Ephraim and prophetically indicated that he would become the greater.—Ge 48:13-20
First Chronicles 7:20-27
provides a genealogical listing of Ephraim’s sons and later descendants, concluding with Joshua, who led the Israelites into the Promised Land. Ezer and Elead, who were likely sons of Ephraim, were slain by the men of Gath. Sometime after the death of these sons, Ephraim fathered Beriah."
Ephraim — Watchtower ONLINE LIBRARY