In temples of God, families are eternally sealed through this power. Couples who enter into the Covenant of Eternal Marriage are sealed together, meaning that their union on earth is also valid in the heavens, rather than ending at death. Children who are subsequently born to them or later sealed to them are theirs for eternity… In addition, temple sealings are performed by proxy for the dead, with spouses sealed to each other and children sealed to parents.
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2010, Christopher Kimball Bigelow, Jonathan Langford, The Latter-day Saint Family Encyclopedia, page 306:
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If a man once married desires a second helpmate […] she is sealed to him under the solemn sanction of the church.
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1852, Howard Stansbury, An Expedition to the Valley of the Great Salt Lake of Utah:
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She can be sealed to this other man and still remain with her first husband; and the Mormons believe that all her children will belong to the man to whom she is sealed.
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1870, Aaron Harrison Cragin, Execution of Laws in Utah, page 9:
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Next, I was sealed to my fourteenth wife, Emeline Vaughn. In 1851, I was sealed to my fifteenth wife, Mary Lear Groves. In 1856, I was sealed to my sixteenth wife, Mary Ann Williams.
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2001, Richard W. Slatta, The Mythical West, page 197: