K is the brother of N and X. Y is the mother of N and Z is the father of K.
Which of the following statements is not definitely true ?

E. N IS THE BROTHER OF X.

A is the son of B. C, B`s sister has a son D and a daughter E. F is the maternal uncle of D.
How many nephews does F have ?

C. TWO

(I).   A, B, C, D, E and F are six members of a family.
(II).  One couple has parents and their children in the family.
(III). A is the son of C and E is the daughter of A.
(IV). D is the daughter of F who is the mother of E. How many female members are there in the family ?

C. FOUR

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. How is E related to D ?

C. UNCLE

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 huasband has died. Who is C to B ?

B. BROTHER-IN-LAW