Elder Orson F. Whitney said,
The Prophet Joseph Smith declared----and he never taught
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.
Now, there is a lot said in that quote, but the most important thing that I get from it is that we, ourselves, need to be dedicated to the Lord and to our families. Parents, do good, do things in the goodness of your children. Know that it is not your "fault" how ever they decide to live their lives. Stay strong and always, always be sure that your children know that they are loved by their parents. Siblings, be sure that your brothers and sisters always, always know that you love them. If it is 'hard' to love them, find something to love and be sure that they know that you have found love for them.
What is a covenant and what are covenants that we make with the Father?
Just one last thought!
(In regards to Chapter 16 of the text, "Successful Marriages and Families: Proclamation Principles and Research Perspectives")