Joseph was no doubt younger than Pharaoh...
Joseph was no doubt younger than Pharaoh, but still he became Pharaoh's father or counselor in Genesis 45:8. The word father is used by a subject in addressing a king in 1 Samuel 24:11. Elisha, while the subordinate of Elijah the prophet, addresses him as father in 2 Kings 2:12. Again in terms of a servant to master, or in this case a soldier to a general, the accompanying soldier addresses Naaman as father in 2 Kings 5:13.
Five distinct groups of meaning appear: 1) a literal biological father, 2) an ancestor, 3) an inventor or prototype, 4) someone who gives counsel or information, and 5) someone to whom absolute obedience is due. Considering that Jesus says that he came to do nothing but his Father's will, the last definition of father is probably the most appropriate as applied to his relationship with God. Jesus is called the Son of God because he perfectly carries out the will of God.
It was Christian failure to understand this true meaning that made it necessary, for example, to use another metaphor in the Qur'an for Jesus: servant of God. Neither metaphor completely describes the uniqueness of Christ the Messiah in the Scriptural belief system. They are only two expressions among many.
All such expressions as father and son, master and servant, are merely metaphorical and cannot perfectly describe anyone's relationship to God, whose being and essence are completely outside the realm of human expression and language. To say that a person is a child of God or a servant of God is only to point out the relationship as a recipient of divine grace and the responsibility of obedience. God is not anyone's literal father or slave master.
Those are human relations that merely approximate or give a direction in understanding. The Bible uses other terms as well, such as `husband', for God, and metaphorically `unfaithfulness' for sin. All such expressions are only useful to the extent that they inspire one to submit to God's will. They are not intended to give information about the nature of God, His essence, being or attributes.
It appears that the expression Son of God is also used, similarly to the expression Son of Man, to intimate that Jesus is the promised Messiah. That can be inferred from Daniel 3:24, if this text has a messianic implication. Let it be noted that Jesus himself did not like to use the term at all. He preferred other expressions of his Messiah ship, most especially the expression Son of Man. Previous…