Jacob's Legal Adoption of Ephraim and Manasseh
Question
Why did Israel or Jacob the man take Joseph’s sons Manessa and Ephraim as his own?
This is based on Genesis 48:5: “And now thy two sons, Ephraim and Manessa, which were born unto thee in the land of Egypt before I came unto thee into Egypt, are mine; as Reuben and Simeon, they shall be mine.” This is Israel or Jacob speaking to Joseph. I am going to take your sons and I am going to take them as mine.
Originally published in Vol. 1, Number 9, September 2026, Ask The Theologian Journal.
Answer
Jacob’s action in Genesis 48:5 appears to be a formal, legal adoption rather than a sentimental gesture. He declares that Ephraim and Manasseh are to be regarded “as Reuben and Simeon,” that is, as full sons with standing equal to his first and second born. This is best understood in terms of inheritance and tribal status within Israel.
In the ancient Near Eastern setting, inheritance normally flowed to sons, not to grandsons directly. By adopting Joseph’s two oldest sons as his own, Jacob ensured that Joseph’s line would receive a double portion. Instead of there being one tribe of Joseph, there would be two full tribes, Ephraim and Manasseh, each with its own inheritance. This explains why, in the tribal listings, Ephraim and Manasseh commonly appear as distinct tribes, not “half-tribes” in any substantive sense.
Inheritance, tribal structure, and legal standing
The language of Genesis 48 suggests a legal transaction. Ephraim and Manasseh remain, in a natural sense, Joseph’s sons, yet Jacob’s declaration places them in the line of direct heirs. Each will have territory and a tribal identity under his own name. This is the mechanism by which Joseph receives a double portion among the tribes.
There may also be an implicit concern about whether the inheritance could pass to grandsons born outside the land. Jacob states that these two were born “in the land of Egypt before I came unto thee into Egypt.” Since they were born in Egypt to a mother of Egyptian background, one could later argue that they are not fully within the covenant people and therefore not fit to receive a tribal allotment in Canaan. Jacob preempts such an objection by explicitly naming them as his sons and attaching his own name to them.
The blessing and the prominence of Ephraim
The subsequent blessing clarifies Jacob’s intention. In Genesis 48:13–16 Joseph positions Manasseh, the firstborn, at Jacob’s right hand and Ephraim, the younger, at his left. Jacob deliberately crosses his hands:
“And Israel stretched out his right hand, and laid it upon Ephraim’s head, who was the younger, and his left hand upon Manessa’s head, guiding his hands wittingly; for Manessa was the firstborn. And he blessed Joseph, and said, God, before whom my fathers Abraham and Isaac did walk, the God which fed me all my life long unto this day, the Angel which redeemed me from all evil, bless the lads; and let my name be named on them, and the name of my fathers Abraham and Isaac; and let them grow into a multitude in the midst of the earth.”
Verse 16 is particularly significant. Jacob wants “my name be named on them, and the name of my fathers Abraham and Isaac.” He is consciously placing the patriarchal line and the covenantal identity upon these two grandsons. Given that their mother is Egyptian, this act firmly situates them within Israel rather than Egypt. Had Jacob not done this, one could argue that a future “tribe of Joseph” would lack qualified heirs because Joseph’s sons were born of an Egyptian mother.
Ephraim, although the younger, receives the right-hand blessing and becomes especially prominent. Later, the name Ephraim is used at times as a designation for the northern kingdom, effectively standing in for “Israel” (for example, in Hosea). This confirms the far-reaching nature of Jacob’s blessing and the tribal significance of this adoption.
In summary, Jacob’s adoption of Ephraim and Manasseh is best seen as a deliberate legal action to grant Joseph a double portion, to secure full tribal and inheritance rights for two grandsons born in Egypt to an Egyptian mother, and to bind them unmistakably to the patriarchal line by placing his own name upon them.