Answer:
Lev Vygotsky's sociocultural theory.
Step-by-step explanation:
Lev Vygotsky's sociocultural theory deals with the cognitive development of individuals and it states that cognitive abilities are usually influenced by environmental/social factors influences which could be from parents, guardians or peers. The individuals also adopt these influences and culture .
When many stories told by your grandparents about your ethnic and cultural background greatly influences individuals to continue the customs, beliefs, and values of that culture, it provides support for Lev Vygotsky's sociocultural theory.