In a family, there are six members A, B, C, D, E and F. 

A and B are a married couple, A being the male member. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died. How is E related to C ? 

Pointing to a lady, Diwakar said, "Her mother's only grandson is my son." How is that lady related to Diwakar?

M is brother of N. B is brother of N. M is brother of D. But N is not brother of D. How is N related to D?

Pointing towards a girl, Rajan said, she is the daughter of my mother's daughter. Then how is the girl related to Rajan?

Punit said to a lady, "The sister of your father's wife is my aunt". How is the lady related to Punit?

If 'A + B' means 'A is father of B', 'A – B' means 'A is mother of B', 'A * B' means 'A is brother of B' and 'A % B' means 'A is sister of B', then how is Q related toS in 'P + Q * R – S'?

Rajiv is the brother of Arun. Sonia is the sister of Sunil. Arun is the son of Sonia. How is Rajiv related to Sunil?

A man said to a lady, "Your mother's husband's sister is my mother." How is the man related to the lady.

'A' and 'B' are brothers. 'C' and 'D' are sisters. A's son is D's brother. How is B related to C?