Question

Rohan is vasu's father's brother's only son. How is Vasu related to Rohan?

Answer 1

To break this, first deal with the complex bit.

Vasu's father's brother's only son is the complex bit.

So Vasu's father has a brother, whose only son is Rohan.

As father of Vasu and father or Rohan are brothers, Vasu and Rohan will be cousins.

They would call each other's fathers uncle.

Answer 2

This is an easy relationship. If Vasu's father has a brother, then he is Vasu's uncle.

Now Vasu's father's brother has a son which means Vasu's uncle has a son. His name is Rohan.

Now, Rohan is directly related to Rohan through their grandparents. This is because Rohan is Vasu's uncle's son. So Rohan is basically Basu's cousin.