In this latter day the promise of eternal families was restored in 1829 when the powers of the Melchizedek Priesthood were restored to the earth. Seven years later, in the Kirtland Temple, the keys to perform the sealing ordinances were restored, as recorded in the Doctrine and Covenants:
“Elijah the prophet, who was taken to heaven without tasting death, stood before us, and said:
“Behold, the time has fully come, which was spoken of by the mouth of Malachi — …
” … The keys of this dispensation are committed into your hands” (D&C 110:13 – 14, 16).
With the restoration of these keys and priesthood authority comes the opportunity for all who are worthy to receive the blessings of eternal families. “Yea the hearts of thousands and tens of thousands shall greatly rejoice in consequence of the blessings which shall be poured out, and the endowment with which my servants have been endowed in this house” (D&C 110:9).
By divine commandment, spouses are required to love each other above all others. The Lord clearly declares, “Thou shalt love thy wife with all thy heart, and shalt cleave unto her and none else” (D&C 42:22). The proclamation states: “By divine design, fathers are to preside over their families in love and righteousness and are responsible to provide the necessities of life and protection for their families [see D&C 83:2 – 4; 1 Tim. 5:8]. [By divine design,] mothers are primarily responsible for the nurture of their children.” By divine design, husband and wife are equal partners in their marriage and parental responsibilities. By direct commandment of God, “parents have a sacred duty … to teach [their children] to love and serve one another, to observe the commandments of God and to be law-abiding citizens [in the countries where they reside]” (Ensign, Nov. 1995, 102; emphasis added; see D&C 68:25 – 28; Mosiah 4:14 – 15).
Talk Source: https://www.lds.org/general-conference/1996/10/the-eternal-family?lang=eng