What was the relationship between Isaac and Esau?
Isaac preferred Esau, because he liked to eat his game. Esau begged him with tears to bless him too. Genesis 25:28; Genesis 27:34, 38
What the Bible says
Genesis 25:28
Isaac loved Esau, because he ate of his hunting: and Rebecca loved Jacob.
Genesis 27:34
Esau having heard his father’s words, roared out with a great cry: and being in a great consternation, said: Bless me also, my father.
Douay-Rheims Bible (Challoner revision), public domain.