TSK
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God said, "No, but Sarah, your wife, will bear you a son. You shall call his name Isaac. I will establish my covenant with him for an everlasting covenant for his seed after him.
God said to Abraham, "Don't let it be grievous in your sight because of the boy, and because of your handmaid. In all that Sarah says to you, listen to her voice. For from Isaac will your seed be called.
This is the history of the generations of Isaac, Abraham's son. Abraham became the father of Isaac.
Abraham became the father of Isaac. Isaac became the father of Jacob. Jacob became the father of Judah and his brothers.
Neither, because they are Abraham's seed, are they all children. But, "In Isaac will your seed be called."