Cultures in which the extended family is common are generally collectivistic cultures.
From the en.wikipedia.org
Collectivistic nations were found to have significantly more individuals who carry the short allele of the STG.
From the sciencedaily.com
They also replicated cultural psychology research demonstrating that nations within East Asia are typically more collectivistic.
From the sciencedaily.com
In the first, participants were analyzed for collectivistic or individualistic tendencies before rating similarities among products.
From the sciencedaily.com
In more traditional and collectivistic societies, increases in individualism can be associated with anxiety and lower well-being.
From the psychcentral.com
In support of this argument, the researchers found that there was less of a relation between extraversion and pleasant affect in the collectivistic sample.
From the sciencedaily.com
Northwestern researchers replicated that finding and also replicated cultural psychology research which has shown that nations within East Asia are typically more collectivistic.
From the usatoday.com
More examples
Collectivist: subscribing to the socialistic doctrine of ownership by the people collectively
Collectivism is a term used to describe any philosophic, political, economic or social outlook that emphasizes the interdependence of every human in some collective group and the priority of group goals over individual goals. Collectivists usually focus on community, society or nation. ...
A type of culture in which group work or teamwork is valued over individual accomplishment.
The tendency to focus on the goals, needs, and views of the ingroup rather than individuals' own goals, needs, and views. (Compare with individualistic.)