A Supplanter Is Born

We are moving on into the next section or "toledot" of Genesis. Why does Isaac get so much less of his story told than his father Abraham, or his son Jacob? Is there a lesson there for us? How does Isaac respond to his wife's inability to conceive a child? The pregnancy that finally occurs turns out to be very difficult. Why? A new major theme surfaces in Genesis. What is it? What is God's explanation to Rebekah for the violent struggle she is feeling? Is it O.K. for us to ask God "why?" How should we respond to His answer?