My father's son = myself (X). My father's son's wife = X's wife. So Y's mother is X's wife, making Y the son of X. X is Y's father. Wait - reconsidering: Y's mother is wife of X. So X is Y's father.

O is father of M. P is brother of O. So P is uncle of M. M is mother of N. So P is great-uncle (great-grand-uncle) of N.

Arranging based on clues: C-A-E-F-G and B-C. Order: B-C-A-E-F-G-D or similar. With 7 people, 4th position is middle. After arrangement: C is in middle position.

Circular arrangement: M opposite N means 4 seats apart. O is right of M. P is between M and O. Clockwise from N to O passes through 3 people (excluding N and O).

My mother's brother = my uncle. My mother's brother's mother = my grandmother. Daughter of my grandmother and my uncle's mother = my aunt or uncle's sister. Woman is Vikram's cousin.

In circular arrangement with A opposite B, C right of A, D between A and C. Clockwise from B to C: 4 people.

In hexagonal arrangement: A-B-?-C-E-D-F (opposite pairs). B is opposite to E.

These are squares of prime numbers: 2², 3², 5², 7², 11², 15² = 225. Wait, 15 is not prime. Actually: 2², 3², 5², 7², 11², 13² = 169. The answer is 169, but checking: odd numbers squared: 1², 3², 5², 7², 11², 13² = 4, 9, 25, 49, 121, 169. The next after 121 is 13²=169.

Arrangement: F-A-B-D-E-C-G (left to right). D at position 4. B is 3rd to right of A. F at end. E between C and G. C has G to its right, so 1 person. Rechecking: F-A-B-D-C-E-G works with E between C and G? No. Valid: F-A-B-D-G-E-C has E not between. Correct: A-B-?-D-C-E-G-F: B is 3 to right of A (positions 1,4 - no). Let me recalculate: A(1)-B(4)-D(4)? Invalid. After careful analysis: F-A-B-D-E-C-G satisfies all. C at position 6, G at 7 = 1 person right. Re-examining: Answer is 3 (positions 4, 5, 6 ahead of some arrangement).

Ravi's father's wife is Ravi's mother. Ravi's mother's only son is Ravi himself. So the girl is the daughter of Ravi, making her Ravi's daughter.