I speak ... - John 3:11-13.
My Father - God.
Your father - The devil. See John 8:44. To see here means to learn of. They had learned of or been taught by the devil, and imitated him.
Related Commentaries of John 8:38
John 8:38
38 I speak that which I have seen with my Father: and ye do that which ye have seen with your father.