M and N had four children P, Q, R and S. Of them, only P and R were married. They had children X and Y respectively

Q. M and N had four children P, Q, R and S. Of them, only P and R were married. They had children X and Y respectively. If Y is a legitimate child of W, which one of the following statements is necessarily FALSE?

(A) M is the grandmother of Y

 (B) R is the father of Y

 (C) W is the wife of R

 (D) W is the wife of P

Ans: W is the wife of P

Sol:

W can’t be wife of P.
W can be husband or wife of R.
R can be father or mother of Y.
M can be grandfather of Y.