Pointing to a man in a photograph, Riyana said, "His brother’s father is the only son of my grandfather”. How is the Riyana related to the man in the photograph?

Sister

↑ or ↓ ⇒ Upward or downward line shown "generation gap".

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation in same generation other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒ Plus sign shown " Female".

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ATQ,

The 3rd option is satisfying the equation.

Therefore, 3rd option is correct.