God the Eternal Father, our Father in Heaven, is an exalted, perfected, and glorified Personage having a tangible body of flesh and bones (Doctrine and Covenants [D. & C.] 130:22). The designation Father is to be taken literally; it signifies that the Supreme Being is the literal Parent or Father of the spirits of all men (Heb. 12:9). All men, Christ included, were born as His children in pre-existence [pre-mortal life] (D. & C. 93:21-23; Moses 1; 2; 3; 4; Abraham 3:22-28). This is the reason men are commanded to approach Deity in prayer by saying, "Our Father which art in heaven." (Mormon Doctrine, p. 278, by LDS Apostle Bruce R. McConkie)

The holy (LDS) scriptures give an account of a great council which was held in the spirit world before man was placed on the earth. This meeting, known as the Council in Heaven, was presided over by God our Eternal Father; and those in attendance were His sons and daughters … The principal purposes of the great gathering were to consider carefully the problem of the eternal progression of man and to present to the assembled throng the "Great Plan of Salvation." The law of growth or progression is one of the eternal laws of life. All other laws contribute to it. Our Eternal Father has attained His position of exaltation and Godhood by obedience to the great law of progression… God the Eternal Father, who was the supreme intelligence at the great council, being more intelligent and more powerful than all the rest of the group combined, desired that His spirit-children should attain the same degree of glory that was then His… Our Heavenly Father proposed as the center of the plan of salvation that one of His sons be appointed to be the Savior of the world… Only in and through His name could men be brought back into the presence of their Heavenly Parents… In that assembled throng there was "one like unto God." This glorious personage volunteered to be the Savior of the world, humbly declaring "Father, Thy will be done, and the glory be Thine forever." Thereupon the Father accepted His offer and foreordained Him to this great mission. This individual, while acting as the mediator, was none other than Jehovah of the Old Testament, and when He lived in mortality He was Jesus Christ of the New Testament. Michael the archangel, commonly known to us as Adam, was appointed to be the first mortal man; and Eve, a spirit of comparable brilliance and faithfulness, was assigned to be his helpmate—the "mother of all mortals." Abraham, Isaiah, Jeremiah, Joseph Smith and others of the holy prophets were foreordained to positions of leadership in their respective dispensations, and Mary was chosen to be the mother of the Son of God… The appointment of Jesus to be the Savior of the world was contested by one of the other sons of God. He was called Lucifer, son of the morning. Haughty, ambitious, and covetous of power and glory, this spirit-brother of Jesus desperately tried to become the Savior of mankind. (The Gospel Through the Ages, pp. 12-15).

Christ… is the Firstborn of the Father. By obedience and devotion to the truth He attained that pinnacle of intelligence which ranked him as a God, as the Lord Omnipotent, while yet in His pre-existent state [pre-mortal life] (Mormon Doctrine, p. 129).