Esau did reconcile with Jacob, but he never regained his FIRST BORN birth rights. Could this be the root of the problem? Why is being first born so special in scriptures? Look for example what happened to Reuben the first born of Jacob, his birth rights were taken away because of sin:
Genesis 48 (KJV)
¹⁷ And when Joseph saw that his father laid his right hand upon the head of Ephraim, it displeased him: and he held up his father's hand, to remove it from Ephraim's head unto Manasseh's head.
¹⁸ And Joseph said unto his father, Not so, my father: for this is the firstborn; put thy right hand upon his head.
¹⁹ And his father refused, and said, I know it, my son, I know it: he also shall become a people, and he also shall be great: but truly his younger brother shall be greater than he, and his seed shall become a multitude of nations.
²⁰ And he blessed them that day, saying, In thee shall Israel bless, saying, God make thee as Ephraim and as Manasseh: and he set Ephraim before Manasseh.
²¹ And Israel said unto Joseph, Behold, I die: but God shall be with you, and bring you again unto the land of your fathers.
²² Moreover I have given to thee one portion above thy brethren, which I took out of the hand of the Amorite with my sword and with my bow.