Step-by-step Solution:

Quick Solution

This question can be answered by directly linking the clues to identify Ajay's grandfather and his profession.

1. Step-by-Step Deduction

1. Identify Ajay's Father: Clue 4 states that Mukesh and his wife have a son, Ajay. Therefore, Mukesh is Ajay's father.
2. Identify Ajay's Grandfather: Ajay's grandfather is his father's father. So, we need to find who Mukesh's father is.
3. Find the Grandfather's Occupation: Clue 2 states, "The lawyer is the head of the family and has two sons - Mukesh and Rakesh...".
   This clue directly tells us that the head of the family is Mukesh's father, and that his profession is a lawyer.

2. Conclusion

Since Ajay's father is Mukesh, and Mukesh's father is the lawyer who heads the family, Ajay's grandfather's occupation is a Lawyer.

Final Answer: Ajay's grandfather's occupation is Lawyer.