Brigham teaches "Father Adam and mother Eve" wants their children to be prepared to go into the Celestial Kingdom.
Brigham Young, "Very Few Will Inherit Celestial Glory," Journal of Discourses, 26 vols. (Liverpool: Joseph F. Smith, 1877), 18:13
There are very few of the children of Father Adam and mother Eve, who will be prepared to go into the Celestial Kingdom. Those who prepare themselves here below, through obedience to the Gospel, receiving through their faithfulness the keys of the Priesthood, and sanctifying themselves through the truth, they are preparing themselves to become the sons of God. If we become the sons of God, we shall be joint heirs with Jesus Christ to all the inheritances that the Father hath prepared for the faithful. But there are few of all the human family that will ever attain to his highest state of glory.