Pointing toward a person in a photograph, Riya said "He is the only son of the father of my sister's brother." How is that person related to Riya?

Brother

↑ 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 1st option is satisfy the equation.

Therefore, 1st option is correct.