A favorite LDS expression. There are two aspects to an eternal family:
(1) the earthly family unit will remain a family unit for all eternity
(2) the family will increase through the procreation of spirit children for all eternity.
The popular thinking is that most faithful Mormons will have an eternal family. However, LDS teachings specifically state that only Mormons who have reached exaltation will have an eternal family.
Biblical Christianity teaches that all believers are members of God’s eternal family (Hebrews 2:11).
