Genesis 17:19

Sarah : the wife of Abraham and the mother of Isaac,daughter of Terah; wife of Abraham

Genesis 21:12

Abraham : a son of Terah; the father of Isaac; ancestor of the Jewish nation.,the son of Terah of Shem

Sarah : the wife of Abraham and the mother of Isaac,daughter of Terah; wife of Abraham

Romans 9:7

Abraham : a son of Terah; the father of Isaac; ancestor of the Jewish nation.,the son of Terah of Shem

Isaac : the only son of Abraham and Sarah; father of Jacob and Esau