Multiple Choice Question

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 respetively. If Y is a legitimate child of W, which one of thr 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