Blood Relations Questions

A is sister of B who is mother of C who is mother of D. E is the grand mother of D. Then how C is related to E ?

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'?

Introducing a man to her husband, a woman said, This brother's father is the only son of my grandfather." How is the woman related to his man ? 

All the six members of a family A, B, C, D, E and F are travelling together. B is the son of C but C is not the mother of B. A and C are a married couple. E is the brother of C. D is the daughter of A. F is the brother of B.  Which of the following is a pair of females ? 

A man pointing to a lady says, “Her brother is the father of my only son's sister.” How is that lady related to the man ?

If A is brother of the son of B's son, how is A related to B?

Pointing to a woman, a girl says,"She is mother of the only child of my father-in-law." How is the woman related to the girl?

Mohan said 'This girl is the wife of grand­son of my mother'. How is Mohan related to that girl?