If A + B means A is the sister of B; A x B means A is the wife of B, A % B means A is the father of B and A - B means A is the brother of B. Which of the following means T is the daughter of P?

Q - P ? Q is the mother of P

P + R ? R is the brother of P

Hence, ? q is the mother of R

R % T ? R is the father of T.

Hence, Q is the grandmother of T.

Because the sex of O is not known.

M + K ? M is the brother of K

K % T ? K is the father of T

T x P ? T is the sister of P

Therefore, K is the father of P and M is the uncle of P.

The boy in the photograph is the only son of the son of Suresh's mother i.e., the son of Suresh. Hence, Suresh is the father of boy.

F3M ? F is the wife of M

M5K ? M is the father of K

Therefore, F is the mother of K.

Ashok is the only brother of Sudeep and Veena is the sister-in-law of Ashok. Hence Veena is the wife of Sudeep. Kalyani is the mother-in-law of Veena. Kalyani is the mother of Ashok.

If D is Male, the answer is Nephew.

If D is Female, the answer is Niece.

As the sex of D is not known, hence, the relation between D and A cannot be determined.

Note: Niece - A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. Nephew - A son of one's brother or sister, or of one's brother-in-law or sister-in-law.

Nalni is the daughter of the only son of Gopi's grandfather. Hence, it's clear that Nalni is the sister of Gopi.

'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?" - Let's see the discussions.