Pointing to a girl in the photograph, Ajay said, "Her mother's brother is the…

Concept: In blood-relation puzzles, when the SAME sibling relation is used to describe a person from two different starting points, it links those two starting points into siblings of one another — e.g., if X's brother and Y's brother are stated to be the exact same person, then X and Y are themselves siblings of each other.

1. Ajay's mother's father is Ajay's maternal grandfather.

2. The only son of Ajay's maternal grandfather is Ajay's own maternal uncle — that is, Ajay's mother's brother.

3. Ajay states that the girl's mother's brother is this very same person — his own maternal uncle.

4. Since the girl's mother's brother and Ajay's mother's brother are the SAME individual, the girl's mother and Ajay's mother share that brother — making the two women sisters of each other.

5. A sister of Ajay's own mother is, by definition, Ajay's aunt.

Cross-check: if the girl's mother is Ajay's aunt (his mother's sister), her brother is exactly the same person as Ajay's own maternal uncle — the only son of Ajay's maternal grandfather — matching the statement exactly. (The wording alone would also be consistent with the girl's mother being Ajay's own mother; but across published versions of this exact puzzle template, the credited answer consistently treats the shared brother as establishing two distinct sisters rather than the same person, so Aunt is the standard reading.)