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You can’t do anything to earn salvation for yourself, neither can you earn it for someone who’s already passed away.
Numerous scriptures come to mind about this but share what Paul said with the Mormons today and ask for their opinion on it.
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Our Father’s Plan Is About Families; “Every soul, living or dead, who is accountable for his or her actions, needs the blessing of these sacred ordinances, and we can help our family members receive them.” — Quentin L. Cook