Question

Each of P,Q, R,S, W,X,Y and Z has married at most once. X and Y married and have two children P and Q. Z is the grandfather of the daughter S of P. Further, Z and W are married and are parents of R. Which one of the following must be false?

• A. X is the mother in law of R
• B. P and R not married to each other
• C. P is a son of X and Y
• D. Q cannot be married to R

Hint:

Always draw a family tree or relationship diagram for complex relationship puzzles.

Answer 1

The Correct Option is B

Step 1: Extract known relations
X and Y are married with children P and Q.
P has a daughter S.
Z is grandfather of S ⇒ Z is father of either P or P’s spouse.
Z is married to W and they are parents of R ⇒ Z and W’s child is R.
Step 2: Connect the lineage
Since Z is grandfather of P’s daughter, and Z’s child is R, then R is likely P’s spouse.
Step 3: Verify the statement
If R is married to P, then statement (2) “P and R not married to each other” must be false.
Hence, that’s the correct choice.