Genesis 46:20

46:20 Manasseh and Ephraim were born to Joseph in the land of Egypt. Asenath daughter of Potiphera, priest of On, ¹  bore them to him.

Genesis 48:5

48:5 “Now, as for your two sons, who were born to you in the land of Egypt before I came to you in Egypt, they will be mine. ²  Ephraim and Manasseh will be mine just as Reuben and Simeon are.

[46:20]  ¹ sn On is another name for the city of Heliopolis.

[48:5]  ² sn They will be mine. Jacob is here adopting his two grandsons Manasseh and Ephraim as his sons, and so they will have equal share with the other brothers. They will be in the place of Joseph and Levi (who will become a priestly tribe) in the settlement of the land. See I. Mendelsohn, “A Ugaritic Parallel to the Adoption of Ephraim and Manasseh,” IEJ (1959): 180-83.