'The only daughter of the father of X's mother' means mother of X. Hence X is the son of the lady in the photograph.
Pointing a photograph X said to his friend Y, "She is the only daughter of the father of my mother." How X is related to the person of photograph?
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Question context
This question is part of 💬 Verbal Reasoning within the broader 🧠 Aptitude Mastery subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.