What was the relationship between Rebekah and Esau?
Rebekah was the mother of Esau. She gave birth to him together with Jacob, his twin. Genesis 25:24-25
What the Bible says
Genesis 25:24
And when her time was come to be delivered, behold twins were found in her womb.
Genesis 25:25
He that came forth first was red, and hairy like a skin: and his name was called Esau. Immediately the other coming forth, held his brother’s foot in his hand, and therefore he was called Jacob.
Douay-Rheims Bible (Challoner revision), public domain.