All societies use kinship as a basis for forming social groups and for classifying people. However, there is a great amount of variability in kinship rules and patterns around the world. In order to understand social interaction, attitudes, and motivations in most societies, it is essential to know how their kinship systems function. I n many societies, kinship is the most important social organizing criterion along with gender and age.
Kinship also provides a means for transmitting status and property from generation to generation.
It is not a mere coincidence that inheritance rights usually are based on the closeness of kinship links. They have an affinity bond with you and are your affines or affinal relatives. They have a consanguinity relationship with you. It is a term that came into use during earlier times in Europe when it was commonly thought that blood is passed between parents and children during conception and that this is how they receive their genetic characteristics. The actual genetic material that we inherit consists of microscopic DNA molecules within sperm and ova.