Answer:

Introduction:
This question belongs to the class 2 category and requires us to determine the generation a man belongs to based on the given information. To answer this question correctly, it is important to understand the concept of generations and how they are defined.

Understanding Generations:
- Generations are typically defined as groups of individuals who are born around the same time and share similar cultural, historical, and societal experiences.
- Each generation is identified by a specific label or number, such as the Baby Boomers, Generation X, Millennials, etc.
- The generation label helps to categorize people based on the common experiences and characteristics they share.

Given Scenario:
- In the given scenario, a man lives with his parents and grandparents.
- It is important to note that a person's generation is determined by their relationship to their parents, grandparents, and so on.
- In this case, the man is living with his parents and grandparents, which means that his parents are the previous generation and his grandparents are the generation before that.

Determining the Correct Generation:
- Based on the given information, we can determine the man's generation by counting the number of generations between him and his grandparents.
- Since the man is one generation younger than his parents and two generations younger than his grandparents, he would belong to the third generation.

Conclusion:
Based on the given scenario, the man belongs to the 3rd generation. This is because he is one generation younger than his parents and two generations younger than his grandparents. It is important to understand the concept of generations and how they are defined based on the relationship between individuals and their ancestors.