Esau was one of their twin sons.
The other one was Jacob.
Your are probably referring to Jacob and Esau. They were twins born to Isaac and Rebekah. God chose Jacob to continue the Hebrew (Israel) race and He rejected Esau. Esau became the "father" of the Edomite's. They would be distant cousins of Israel. To read of the fascinating story of Jacob and Esau see Genesis, chapter 27.
Rebekah
The mother of Isaac in the bible is Rebecca /Rebecka /Rebekah.
The father of Jacob and Esau was Isaac, whom were borne by his wife Rebekah.
Isaac had two sons that he loved: Jacob & Esau
Isaac's two sons, Jacob and Esau, buried him.
Jacob and Esau were Isaac and Rebekah's children.
Isaac and Rebekah had twins; Jacob and Esau.
Jacob's mother was Rebekah, who was the wife of Isaac and the mother of Jacob and his twin brother Esau. Rebekah played a prominent role in the biblical narrative involving the rivalry between Jacob and Esau.
His father, Isaac. Rebekah the mother of the boys loved Jacob more.
Jacob would kick when she would pass a house of God, and Esau would kick when they would pass a house of idol worship.
Ultimatly, Rebekah was part of the line of David. Rebekah gave birth to twins, Esau and Jacob. Jacob, known as Isreal, is part of the geneology to the line of David, of which Jesus was born.