Indicating to a man in the photograph Ravish said, I am the only child of my parents but that man’s father is my father’s son. How is the man in the photograph related to Ravish?

Son

ATQ,

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Please note:

  l   ⇒ Vertical line shown "generation gap".

 =  ⇒ Double lines shown "relation of spouse" 

—  ⇒ Horizontal line shown "relation in same generation other than spouse".

     ⇒ Rectangular box shown " Male".

     ⇒ Circular box shown " Female".

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