Final answer:
Anthropologists refer to a family group larger than a nuclear family that includes relatives from both the mother's and father's sides as an extended family.
Step-by-step explanation:
The people in the diagram you're referring to are members of a bilaterally extended family group larger than a nuclear family, which anthropologists would refer to as an extended family. This type of family includes not only the immediate nuclear family, which consists of parents and their children, but also incorporates additional family members from both maternal and paternal sides.
The extended family may include grandparents, aunts, uncles, cousins, and others who are related by blood (consanguineal ties) or through marriage (affinal ties). The characteristics of these kinship systems can vary widely among different cultures and societies.
An extended family encompasses several generations, extending beyond parents and children. Grandparents, parents, children, aunts, uncles, and cousins may all be part of this larger family unit.
Extended families are not limited to the nuclear family's direct lineage. They include relatives from both the maternal and paternal sides, forming connections through matrilineal (mother's side) and patrilineal (father's side) ties.