Genesis 24:3 establishes the family pattern: Abraham sought a wife for Isaac from his own kindred, a model Jacob now follows.

Genesis 26:34 records the specific Hittite marriages Esau made that now troubled his parents — the very events prompting Esau's realization here.

Genesis 26:35 states these Hittite wives were 'a source of grief' to Isaac and Rebekah — confirming the displeasure Esau now recognizes.

Genesis 27:46 shows Rebekah explicitly stating her disgust with Esau's Hittite wives — this directly motivates the family dynamics Esau now responds to.