The definition of kinship is subjective

Summary:
Based on the readings, Kinship and Gender by Linda Stone, kinship is conventionally defined as relationships between persons based on descent or marriage. It is an ideology of human relationships and this whole kinship system encompasses the rights and obligations recognized between kin or groups of kin and also the categories in which kin are linguistically classified and the rules or norms that specify modes of descent, patterns of residence and forms of marriage. In general, there are two forms of kinship, either based on descent or affinal relationships, which is commonly known as marriage. Marriage is found in some of the societies, and it is widely associated with the legitimization and allocation of children.
In Everyday life in Southeast Asia, Chapter 4, kinship terms are used strategically for those with whom there is a need to cooperate or have a relationship with. Kinship can be created by fiction, adoption, marriage, including with foreigners and immigrants where physical traits seem not to be an issue.

Comments:
These definitions and the whole idea of kinship system acts like a guideline, as a hierarchy system for us to follow. However, there are loopholes to this definition of kinship. In my opinion, groups of kin should only refer to groups of blood related family members and relatives whom you have built strong ties with and you yourself consider them as a kin. Kinship should not be mere systems which people are associated with by name, but in reality, they do not feel emotionally attached to. The boundaries for kinship system and the whole definition of kinship are not definite. For example, do you consider an adopted child, a kin, to the family he has been adopted into? How about step parents and step siblings? How about couples who have been cohabitating with each other for decades but only lack the official registry at the Registry of Marriage (Singapore’s context). From their point of view, they definitely consider themselves are kin. But based on the definitions of kinship system, they are not considered affinal relatives since they are not officially married. Therefore, this goes to show that the boundaries for defining kinship and kinship system is blurring. In the end, it is up to the individual to decide who they want to treat as kins. In addition, it was stated in Everyday life in Southeast Asia, Chapter 6 that the role of marriage includes the idea of social identity, besides the common biological reproduction. Marriage transforms in the face of economic changes. In the Lisu village in Northern Thailand, there is intergenerational wealth transfer from the parents’ household to the bride and groom. Villagers in the village might get married purely for the sake of improving their family’s financial situation. The role of marriage differs in different societies. In my opinion, marriage and kinship systems are different in different societies, and therefore, the notion, ideas and definitions of kinship should be defined separately for different societies too. Kinship definitions should be based on different social contexts since kinship itself is a social construct.

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