“Kinship systems are cultural conceptualizations of relationships between individuals, based on the notion of descent and clan membership… kinship systems structure social networks of exchange between kin (related by descent) and affines (related by marriage).”

References

Delêtre, M., McKey, D. B., and Hodkinson, T. R. 2011. Marriage exchanges, seed exchanges, and the dynamics of manioc diversity. Proc. Natl. Acad. Sci. 108:18249–18254. https://doi.org/10.1073/pnas.1106259108