"Jacob said to Rebekah his mother, 'But my brother Esau is a hairy man while I have smooth skin. What if my father touches me? I would appear to be tricking him and would bring down a curse on myself rather than a blessing.' His mother said to him, 'My son, let the curse fall on me. Just do what I say; go and get them for me.'" NIV translation
Jacob had second thoughts about tricking his father but we see that it was not because of the sin of not honoring his father but the fear of being caught. We also see that it was his mother that insisted that he deceive his father. One might ask what she was thinking and, although we are only guessing, she probably was thinking that she was helping God to fulfill His promise to her. Before we are quick to condemn her, we might ask ourselves if we do not do the same thing at times. It is easy to get impatient and sorta give God's will a boost (or so we think).
"So he went and got them and brought them to his mother, and she prepared some tasty food, just the way his father liked it. Then Rebekah took the best clothes of Esau her older son, which she had in the house, and put them on her younger son Jacob. She also covered his hands and the smooth part of his neck with the goatskins. Then she handed to her son Jacob the tasty food and the bread she had made." NIV translation
They continued with their plan to "assist God". We notice that they even went beyond what Isaac had requested as Rebekah baked bread.
Why is this account in the Bible? It shows us that, even though these people would be used by God, they were still people and families with problems just like us.
"He went to his father and said, 'My father.' 'Yes, my son,' he answered. 'Who is it?' Jacob said to his father, 'I am Esau your firstborn. I have done as you told me. Please sit up and eat some of my game, so that you may give me your blessing.' Isaac asked his son, 'How did you find it so quickly, my son?' 'The Lord your God gave me success,' he replied." NIV translation
In the deception of his father, Jacob even lied and said that God was with him. This is a reminder to us that we need to test the Spirit. Just because someone uses the word "god" it does not automatically mean that it is of God.