the Tribe of Manasseh: Descended from Joseph's Eldest Son Adopted by Jacob
Source: TTT
Genesis 41:51
Joseph named the firstborn Manasseh, saying, “God has made me forget all my hardship and all my father’s household.”
Genesis 48:5
And now your two sons born to you in Egypt before I came to you here shall be reckoned as mine; Ephraim and Manasseh shall be mine, just as Reuben and Simeon are mine.