Pointing towards a gentleman, Rahul said, "His only brother is the father of my daughter's father.". How is the gentleman related to Rahul?

Uncle

The correct answer is Option (4) → Uncle

Let’s break the statement step by step:

• “My daughter’s father” = Rahul himself
• “Father of my daughter’s father” = Rahul’s father
• “His only brother is the father of my daughter’s father”
  ⟹ The gentleman’s only brother is Rahul’s father

So, the gentleman is the brother of Rahul’s father.

Therefore, the gentleman is Rahul’s uncle.