Thematic Bible: The ruling personality in the home

So she said to Abraham, Send away that woman and her son: for the son of that woman is not to have a part in the heritage with my son Isaac. And this was a great grief to Abraham because of his son. But God said, Let it not be a grief to you because of the boy and Hagar his mother; give ear to whatever Sarah says to you, because it is from Isaac that your seed will take its name.