In Genesis, Before Jacob dies, he has a conversation with his son, Joseph.
Some time later Joseph was told, “Your father is ill.” So he took his two sons Manasseh and Ephraim along with him. 2 When Jacob was told, “Your son Joseph has come to you,” Israel rallied his strength and sat up on the bed. 3 Jacob said to Joseph, “God Almighty[a] appeared to me at Luz in the land of Canaan, and there he blessed me 4 and said to me, ‘I am going to make you fruitful and increase your numbers. I will make you a community of peoples, and I will give this land as an everlasting possession to your descendants after you.’ 5 “Now then, your two sons born to you in Egypt before I came to you here will be reckoned as mine; Ephraim and Manasseh will be mine, just as Reuben and Simeon are mine. 6 Any children born to you after them will be yours; in the territory they inherit they will be reckoned under the names of their brothers.
What is up with this passage? Why is Jacob insisting that Joseph's sons were his?