Esau married two children of the devil:
Esau married two Hittite women who were idol worshippers (women who belonged to Satan). One was named Judith and the other Bashemath. The name Judith can mean "confession". Her father was Beeri. That name means "my well". Therefore, one can say that her name meant "confession for my well". This name sounds good on the surface until one understands it from the Satanic point of view. The well could mean her body. Satanists, then and today, make a confession to Satan for the fleshly wants and unbridled lusts they want from him. They are after much money, power, fame, and unrestrained sexual activity as part of their worship to the devil. The name Bashemath means "confusion of death". Her father was Elon. That name means "strong". Therefore, one can say that her name meant "strong confusion of death". Satan likes to keep people confused about death. He confused Eve about death in the Garden of Eden as he reached out for ownership of her soul. Let us not be confused about where a saved person goes after he or she dies. The bible states-
"...to be absent from the body, and to be present with the Lord"
(2 Corinthians 5:8).

Esau brought these two unsaved, idol worshipping women home with him. So, what was the problem? The main problem was spiritual. These women probably got Esau to worship idols also. Years later, the idol worshipping wives of King Solomon got him to worship idols also and turned his heart away from God
(1 Kings 11:4). Just think of the gossip that went around- the grandson of Abraham was worshipping the devil. It was so bad, that God stated that he hated Esau. Why? Allegedly, because Esau was possessed by the devil
(Malachi 1:3). I believe that Isaac and Rebekah were Satanically oppressed. Why? Well, demons receive worship when idols are worshipped. As Esau and his wives kept on worshipping idols, Satan and his imps kept on coming to Esau's home to receive the worship that they desired so badly. Isaac and Rebekah lived in a nearby tent to Esau and his wives. It is the nature of Satan, not only to receive worship in a certain location where he is welcomed, but to also oppress any folks nearby who love the Lord. So I believe that Isaac and Rebekah, who belonged to God, were continually oppressed by Satan and his imps (demons and evil spirits) and these righteous folks had to resort to continuous spiritual warfare. The expression "grief of mind" can also be interpreted to mean "bitterness of spirit". That means that Esau and his wives grieved Isaac and Rebekah's spirits. I am sure that they had to go to intercessory prayer on behalf of Esau and his wives.

How bad was it? These women acted like unsaved women did in those days. They did not love or worship God- one could say that they had a different value system as "they did not go to church with Isaac and Rebekah". Those women dressed like unsaved women did in those days. One or both might have tried to sexually seduce Jacob. They probably ate food offered to idols. They may have been extremely selfish and spoiled- they may not have helped anyone but themselves. There may have been violent quarrels in the tent of Esau. And there may have been other reasons not mentioned here. That is why there was problems.

Esau, as a teenager, probably knew his grandfather, Abraham. He knew that Abraham wanted Isaac, his father, to marry a woman who loved the Lord. Esau knew what Abraham told his servant:
"And I will make thee swear by the Lord, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell"
(Genesis 24:3). So, did Esau follow his grandfather's example and marry a woman who loved the Lord? I think not. Esau was forty years old when he married. Years earlier, Isaac was forty years old when he got married. But Esau was a big disappointment to his parents when he embraced Satan. Esau's spiritual condition was so bad that Rebekah did not want Esau to receive the birthright.

Sometimes the best of Christian families can have a son or daughter who goes astray. God does not make any robots. Each individual is wonderfully and specially made by Him and has free will. That individual can choose to love God or not. If you have an unsaved family member, pray for that individual on a daily basis
(James 5:16).

There is a wide separation between the spiritually saved and unsaved. The godly are at odds with the ungodly. Christ stated, in this regard, that He came to bring a sword- a spiritual sword of separation between saved and unsaved family members:
"...whosoever therefore shall confess Me before men, him will I confess also before My Father which is in heaven. But whosoever shall deny Me before men, him will I also deny before My Father who is in Heaven. Think not that I am come to send peace on earth: I came not to send peace, but a sword. For I am come to set a man at variance against his father, and the daughter against her mother, and the daughter in law against her mother in law. And a man's foes shall be they of his own household"
(Matthew 10:32-36).

Esau made some bad choices in his life. Let us learn from his mistakes and not repeat any of them in our lives. He was a bad example for us to learn from.