Esau is, (off the charts), angry

30 As soon as Isaac had finished blessing him and Jacob had left his father’s presence, his brother Esau returned from the hunt. 31 He too made some tasty food, brought it to his father, and said to him, “My father, sit up and eat of your son’s game, so that you may bless me.” 32 But his father Isaac replied, “Who are you?” “I am Esau, your firstborn son,” he answered. 33 Isaac began to tremble violently and said, “Who was it, then, who hunted the game and brought it to me? Before you came in, I ate it all and blessed him—and indeed, he will be blessed!” 34 When Esau heard his father’s words, he let out a loud and bitter cry and said to his father, “Bless me too, O my father!” 35 But Isaac replied, “Your brother came deceitfully and took your blessing.” 36 So Esau declared, “Is he not rightly named Jacob? For he has cheated me twice. He took my birthright, and now he has taken my blessing.” Then he asked, “Haven’t you saved a blessing for me?” Genesis 26:30 - 36 BSB

Esau is of course, wrong, Jacob cheated him once, he sold Jacob the spiritual birthright that he despised.

 41 Esau held a grudge against Jacob because of the blessing his father had given him. And Esau said in his heart, “The days of mourning for my father are at hand; then I will kill my brother Jacob.”

42 When the words of her older son Esau were relayed to Rebekah, she sent for her younger son Jacob and told him, “Look, your brother Esau is consoling himself by plotting to kill you. 43 So now, my son, obey my voice and flee at once to my brother Laban in Haran. 44 Stay with him for a while, until your brother’s fury subsides— 45 until your brother’s rage against you wanes and he forgets what you have done to him. Then I will send for you and bring you back from there. Why should I lose both of you in one day?” Genesis 26:41 - 45  BSB

Esau is rightfully angry. In his culture, the first born inherits the head of household role and all that comes with it. He does not know that God has decreed otherwise. So his solution is to kill his brother Jacob. Rebekah knows he is a hot head, so she once again directs Jacob, "obey my voice". She tells him to go to her brother Laban in Haran. Do you remember him?

< = = = He is the opportunist.

"Indeed", replies John Comfort, "Dad's a boozer, brother is a schemer, Rebekah is sending Jacob into a dysfunctional situation, but it beats getting murdered by his angry brother. Now, this last bit is commented on by many a midrash, tell me what you notice."

46 Then Rebekah said to Isaac, “I am weary of my life because of these Hittite women. If Jacob takes a Hittite wife from among them, what good is my life?” Genesis 26: 46 BSB

< = = = Issac, the head of the household, may suspect she had a part in the theft of the blessing. If so, he may feel that Jacob should stay and be dealt with. But he too, disapproves of Esau's double Hittite marriage and he also does not want it to happen to Jacob, should he survive Esau's wrath. That might end the line of promise, at least through his house. He probably suspects he is being taken advantage of, but all things considered is willing to let it happen.

.John was amazed at the clarity of Alan's analysis. "The lad isn't 13 years old, but he is really on the beam", he thought to himself.