pointing to a photograph lata says, he is the son of the only son of my grandfather. how is the man in the photograph related to lata?

The man in the photograph is related to Lata as her brother. Explanation:

• Lata says, "He is the son of the only son of my grandfather."
• The "only son of my grandfather" refers to Lata's father.
• Therefore, the man in the photograph is the son of Lata's father.
• Hence, the man is Lata's brother