Final answer:
Kinship refers to the culturally defined relationships between individuals thought of as having family ties, which is a sociocultural construct varying across societies.
Step-by-step explanation:
The term culturally defined relationships between individuals who are commonly thought of as having family ties refers to the concept of kinship. Kinship is a sociocultural construct that varies across cultures, defined by social norms, cultural traditions, and socioemotional ties rather than just genetics. In some societies, family is viewed traditionally with clear roles such as father, mother, or child, while in others it's more about the emotional and economic union of individuals who may be connected by blood, marriage, cohabitation, or adoption. Kinship defines social and biological relationships that establish rights and obligations within a network of individuals, and it is adaptive considering the requirements of the society and economic conditions.