Pointing to a picture, Mahesh says that she is the sister of my son's mother. What is the relation of the person in the photograph to Mahesh?

Pointing to a girl, Rahul said “She is the only daughter-in-law of my grandfather’s only daughter-in-law’s only son.” Then how is that girl related to Rahul? 

How is U related P in the given expression? 

U # T × S ÷ R × Q + P 

Divya said, “That lady is my husband’s sister's only sibling’s son's paternal grandmother". How is that lady related to Divya? 

A is B’s brother, C is A’s mother, D is C’s father, E is B’s son. How is D related to A ? 

In the expression P × Q -T how is T related to P? 

A is B’s sister. C is B’s mother. D is C’s Father. E is D’s mother. Then how is A related to D?

‘A+B’ means ‘A’ is the brother of B’.‘A-B’ means ‘A’ is the husband of B’.‘A×B’ means ‘A’ is the mother of B’.‘A÷B’ means ‘A is the sister of B’. If P+R÷T-K×O×C, then how is P related to O?