Question 1 - Were there no sons to the Lord God before Christ?

1 John 4:9 NKJV - "In this the love of God was manifested toward us, that God has sent His only begotten Son into the world, that we might live through Him."

Job 1:6 NKJV - "Now there was a day when the sons of God came to present themselves before the LORD, and Satan also came among them."

Genesis 6:2 NKJV - "that the sons of God saw the daughters of men, that they were beautiful; and they took wives for themselves of all whom they chose."

Answer:

                I John 4:9, “Only begotten son” means there is no second one. It means, the one has no second place, but has first place only. The Lord Christ gained the spirit of the Lord, lived in holy stage among the human beings, taught the path of life to them did the sacrifice for the sins of the world and got resurrection in glory.  

Who were the sons of God mentioned in Genesis 6:2?

The people, who came through the divine son Adam in to this world, were also called sons of God. But, these sons of God, who forgot the divinity in Genesis 6:2 lived with the lust of flesh and sinned by arranging sexual acts with their chosen women. 

But, what about divine angels mentioned as the sons of God in Job 1:6?

They did not live among the people. So, they are not equal to the Lord Christ, who became flesh and lived among the human being to teach the path of love to the human beings and did sacrifice to expiate the sins of the world.  

As you can see there is no one’s birth, life, death or resurrection is like Lord Jesus who is fully God as well as fully human. So, no one gets this first right in this age or the age to come.

So, it is written in 1 John 14:9 as the only begotten son.