Many of us bless our children on Friday nights. The bracha for daughters is pretty easy to understand- among other things we wish them to be as great as Sarah, Rivka and Leah- towering female figures in the Torah, about whom much is known through a pshat reading of Bereshit. The corresponding figures for a son, though, are Ephraim and Menashe. Besides having been born to Yosef and Potiphar's daughter and their deathbed "adoption" by Yaakov, we know almost nothing about them. What are some good sources for their being of such a stature that we would want our sons to emulate them?
If I recall correctly, his explanation is that Ephraim and Menashe were the first Jews that were born and raised in Egypt. When we bless our children to be like Ephraim and Menashe we are saying that they should be able to be a part of the general world but still be able to retain their Judaism at the highest level, just like Ephraim and Menashe.