Family History Work and Genealogy
http://www.lds.org/study/topics/family-history-work-and-genealogy?lang=eng “In the spirit world, the restored gospel is preached to those who died without receiving it in mortality. Many of those in the spirit world accept the gospel, but without a body they cannot receive the ordinances necessary for salvation. The primary purpose of family history work is to obtain names and other genealogical information so that temple ordinances can be performed in behalf of deceased ancestors.
