A is father of X; B is mother of Y. The sister of X and Z is Y. which of the following statements is definitely not true?

Correct Answer: Mother

Explanation:

Clearly, the lady is the grandmother of man's sister's son i.e.. the mother of the mother of man's sister's son 

i.e., the mother of man's sister. So, the lady is man's mother.  

Correct Answer: Grand-mother

Explanation:

My father's brother's only sibling is my father. My father's mother is my grandmother. My sister's only brother is myself. So she is my Grandmother.

Correct Answer: Daughter

Correct Answer: R

Explanation:

Q, the Doctor, is the father of T. S, the Housewife, is the grandmother of T and hence the mother of Q. Since there are only two married couples one being that of Q, the grandfather of R. i.e, U must be married to S. Thus, R and T will be both children of Q and these must be the students So, P, who remains, shall be the wife of Q and she alone can be the nurse. Thus, U must be the contractor 

Clearly, R and T are children of same parent, So. R will be the sister of T. 

Correct Answer: Husband

Correct Answer: Teacher

Explanation:

C is the daughter-in-law of A who is the grandmother of F means C is the mother of F But F is the son of B. 

So. B is C's husband. But C, the lawyer. is married to the Doctor So. B is the Doctor. F. the Accountant, will he the non of B and C E is the unmarried Engineer 

So. the other married couple can be that of grandmother of F. i.e, A and D. But D, the Salesman, is married to the Lady Teacher. 

So. D, the Salesman, is the grandfather of F. father of B and the husband of A. the Lady Teacher. 

A is the Lady Teacher 

Correct Answer: Grand son

Correct Answer: Brother

Correct Answer: Brother

Explanation:

Brother

Justification: Daughter of uncle's father -- Uncle's sister -- Mother;
Mother's son -- Brother.

Correct Answer: Sister