A lady said to a man, "Your father's wife is the only sister of my brother". How is the man related to the lady?

Rahul told Anand "yesterday I defeated the only brother of the daughter of my grandmother".

Whom did Rahul Defeated?

In a family of 8 persons with two couples, P is the son of Q and brother of R; S is the daughter of M, who is married to R. T is the aunt of S and mother of V. R's nephew W is the son of P and has a sister. V. How is V related to M?

Introducing a girl to his girlfriend, Ajay said," Her only brother's mother is the only child of my grandmother." How is Ajay related to this girl?

Pointing to a man a lady said "His mother is the only daughter of my mother." How is the lady related to the man?

In a joint family, there are a father, a mother, 2 married sons and one unmarried daughter. Of the sons, one has 2 daughters and other has a son and a daughter. How many female members are there in the family?

A is the brother of C. D is the wife of M, who is the only son of N. C is the daughter of D. How is A related to N?