When Ravi saw Raamesh, he recalled, ‘He is the son of the father of my daughter’. Who is Raamesh?

The correct choice is: “Son”

Resolve the chain from the speaker's end. The father of Ravi's daughter is Ravi himself, so “the son of the father of my daughter” is Ravi's own son: Raamesh is Ravi's son.

“Uncle”, “Cousin” and “Brother” do not fit, because Raamesh is one generation below Ravi and is his own child.

The published key for this question gave “Brother-in-law”, which would be right only if the statement read “the son of the father of my wife”.