The second wife of Abraham is often forgotten. After the death of Sarah, Abraham took another wife named Keturah and she bore him six sons. He even had sons by his concubines. He was 100 years old when Isaac was born, and then he fathered more children after age 100!

In the commentary on page 52 it mentions that the major events of the first 2500 years have been chronicled as only a brief outline. There are however other writings that fill in many details.

Esau sold his birthright for a bowl of soup. This was a legitimate transaction, unfair though it may seem.

Gen 26:24
That night the LORD appeared to him and said, "I am the God of your father Abraham. Do not be afraid, for I am with you; I will bless you and will increase the number of your descendants for the sake of my servant Abraham."

God promised Isaac that He would bless him because of what his father Abraham had done. Does that make us want to be obedient to the Lord knowing that it will bless our children and future generations?