When parents keep the covenants they have made at the altar of the temple, their children will be forever bound to them

"It is not uncommon for responsible parents to lose one of their children, for a time, to influences over which they have no control. They agonize over rebellious sons or daughters. They are puzzled over why they are so helpless when they have tried so hard to do what they should.

"It is my conviction that those wicked influences one day will be overruled.

"'The Prophet Joseph Smith declared—and he never taught a more comforting doctrine—that the eternal sealings of faithful parents and the divine promises made to them for valiant service in the Cause of Truth, would save not only themselves, but likewise their posterity. Though some of the sheep may wander, the eye of the Shepherd is upon them, and sooner or later they will feel the tentacles of Divine Providence reaching out after them and drawing them back to the fold. Either in this life or the life to come, they will return. They will have to pay their debt to justice; they will suffer for their sins; and may tread a thorny path; but if it leads them at last, like the penitent Prodigal, to a loving and forgiving father’s heart and home, the painful experience will not have been in vain. Pray for your careless and disobedient children; hold on to them with your faith. Hope on, trust on, till you see the salvation of God.' (Orson F. Whitney, in Conference Report, Apr. 1929, p. 110.)

"We cannot overemphasize the value of temple marriage, the binding ties of the sealing ordinance, and the standards of worthiness required of them. When parents keep the covenants they have made at the altar of the temple, their children will be forever bound to them."

- Elder Boyd K. Packer, Of the Quorum of the Twelve Apostles, "Our Moral Environment," General Conference, Apr 1992
http://www.lds.org/general-conference/1992/04/our-moral-environment?lang=eng