Answer: Collectivist culture
Explanation: In a collectivist culture, the needs of a community are valued over and above the needs of an individual. In such a culture, family is given high importance by the individuals and traditions are followed strictly.
In the given case, A and W are brothers and also work together, and when there is one need the other helps him without any benefit as such. Therefore, we can conclude that they live in collectivist culture.