Adam Clarke on Genesis 48:11

I had not thought to see thy face - There is much delicacy and much tenderness in these expressions. He feels himself now amply recompensed for his long grief and trouble on account of the supposed death of Joseph, in seeing not only himself but his two sons, whom God, by an especial act of favor, is about to add to the number of his own. Thus we find that as Reuben and Simeon were heads of two distinct tribes in Israel, so were Ephraim and Manasseh; because Jacob, in a sort of sacramental way, had adopted them with equal privileges to those of his own sons.