The many rules and corresponding obligations specific to marriage in unilineal societies (such as residence rules and marriage compensation) are evidence that families and communities invest a great deal in marriages and the formation of new families. So what happens if a young and newly married spouse dies? What about the marriage compensation and the new household? In many unilineal societies (most especially in patrilineal societies), remarriage obligations ensure that in these cases the marriage contract endures. Remarriage obligations require the widowed spouse to remarry someone from the same lineage in order to maintain the stability of the family unit. There are numerous issues that affect when and how remarriage obligations are enacted. The factors that most affect remarriage obligations are the ages of the spouses and amount of time that has passed since the marriage occurred, the ages of the offspring and whether there are young children within the family unit, and the particular marriage contract and value of the marriage compensation. Cultures (and families) determine how best to enact these rules within their own value systems and based on current need. But the primary underlying purpose of remarriage obligations is to maintain the alliance that was made between the two lineages at the time of the marriage. These are intended to be enduring ties that benefit all members of each lineage. If the husband dies and there is a surviving wife (now widow), under the levirate remarriage rule she will marry one of her husband’s surviving brothers. While levirate will not be invoked in every case, it is quite common when there are young children remaining within the immediate family unit. Because levirate is usually practiced in societies with polygynous families, a married brother taking an additional wife will not disrupt his existing family, and the new wife and her children will remain within the lineage where the children were born. The sororate applies to situations in which the wife dies and there is a surviving widower. Under this remarriage rule, the deceased wife’s lineage must provide a replacement female, preferably the former wife’s sister. If her sisters are already married or there are no sisters available, another female from the same lineage can be sent as a replacement. Sororate allows young children from the first marriage to remain with their father in his lineage and also maintain a symbolic and emotional bond with their biological mother’s kindred. Finally, there is also the highly variable practice of ghost marriage, where a marriage is performed between one or two deceased individuals in order to create an alliance between lineages. Among the Dinka and Nuer of South Sudan, a ghost marriage is similar to the levirate, with the deceased husband’s brother standing in for him in a ghost marriage. Unlike the levirate itself, any children from this second (ghost) marriage will be attributed to the deceased husband and not to the brother or the wider lineage itself. Among Chinese immigrants to Singapore, there are ghost marriage claims in which both spouses may be deceased (Schwartze 2010), continuing a tradition that began generations earlier (Topley 1955).