He saw Ephraim’s sons to the third generation, and indeed the sons of Machir son of Manasseh were brought up on Joseph’s knees.
Here is, I. The prolonging of Joseph's life in Egypt: he lived to be a hundred and ten years old, Gen 50:22. Having honoured his father, his days were long in the land which, for the present, God had given him; and it was a great mercy to his relations that God continued him so long, a support and comfort to them. II.
Commenting on Genesis 50:22-26
And Joseph said unto his brethren, I die,.... Some time before his death he called them together, and observed to them, that he expected to die in a little time, as all must: and God will surely visit you; not in a way of wrath and vindictive justice, as he sometimes does, but in a way of love, grace, and mercy: and bring you out...
Were brought up upon Joseph's knees - They were educated by him, or under his direction; his sons and their children continuing to acknowledge him as patriarch, or head of the family, as long as he lived.