Solution:
Since, the son of the only brother of the lady is the nephew of the lady, Therefore, the wife of the man is the niece of the lady. Hence, the lady is the sister of the father-in-law of the man.

Solution:
Son

Solution:
None of these

Solution:
C and Q are sisters and A is the son of C. Hence, C is the mother of A or Z is the mother Q. Hence, Z is the maternal grandmother of A. P is the son of Z. Hence, P is the maternal uncle of A.

Solution:
Shobha is the niece of Ashish means Ashish is the uncle of Shobha. Now, Priya is Ashish's mother. So, Priya is the grand mother of Shobha. Hari is Priya's father. So, Shobha is the greatgrand daughter of Hari.

Solution:
'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. Note: Still have doubt like "How X is a male?"

Solution:
M is the father of N and N is the son of V. Hence, V is the mother of N. From (1), P is the brother of V Therefore, M is the brother-in-law of P because V is the wife of M. From (2), the daughter of N, is the granddaughter of V. From this we do not get any relation of M to P.