Implicit in the Christian verity that all men are the spirit children of an Eternal Father is the usually unspoken truth that they are also the offspring of an Eternal Mother. An exalted and glorified Man of Holiness (Moses 6:57) could not be a Father unless a Woman of like glory, perfection, and holiness was associated with him as a Mother. The begetting of children makes a man a father and a woman a mother whether we are dealing with man in his mortal or immortal state.
This doctrine that there is a Mother in Heaven was affirmed in plainness by the First Presidency of the Church (Joseph F. Smith, John R. Winder, and Anthon H. Lund) when, in speaking of pre-existence and the origin of man, they said that “man, as a spirit, was begotten and born of heavenly parents, and reared to maturity in the eternal mansions of the Father,” that man is the “offspring of celestial parentage,” and that “all men and women are in the similitude of the universal Father and Mother and are literally the sons and daughters of Deity.” — Man: Origin and Destiny, pp. 348-355; Bruce R. McConkie, Mormon Doctrine, p.516
This glorious truth of celestial parentage, including specifically both a Father and a Mother, is heralded forth by song in one of the greatest of Latter-day Saint hymns. “O My Father” by Eliza R. Snow, written in 1843, during the lifetime of the Prophet, includes this teaching: “In the heavens are parents single? No; the thought makes reason stare! Truth is reason, truth eternal, Tells me I’ve a Mother there. When I leave this frail existence, When I lay this mortal by, Father, Mother, may I meet you In your royal courts on high? Then, at length, when I’ve completed All you sent me forth to do, With your mutual approbation, Let me come and dwell with you.”
Mortal persons who overcome all things and gain an ultimate exaltation will live eternally in the family unit and have spirit children, thus becoming Eternal Fathers and Eternal Mothers. (D&C 132:19-32) Indeed, the formal pronouncement of the Church, issued by the First Presidency and the Council of the Twelve, states: “So far as the stages of eternal progression and attainment have been made known through divine revelation, we are to understand that only resurrected and glorified beings can become parents of spirit offspring.” — Man: His Origin and Destiny, p. 129, Bruce R. McConkie, Mormon Doctrine, p.516-17
We existed with Him in the family relationship as His children . . .
. . . when we see our Father in heaven we shall know Him; and the recollection that we were once with Him and that He was our Father will come back to us, and we will fall upon His neck, and He will fall upon us, and we will kiss each other. We will know our Mother, also. — President George Q. Cannon, Gospel Truth, pp. 1, 3