If ‘A + B’ means ‘B is the son of A’, ‘A – B’ means ‘B is the father of A’, ‘A…

Concept: In a coded blood-relation puzzle, each arithmetic symbol stands for a fixed family relation between the letter on its left and the letter on its right. Decode the expression one operator at a time, left to right, building a family tree as you go, then check every answer statement against that tree.

Application: Decode ‘L ÷ P × Q + R ÷ S’ step by step.

1. L ÷ P: P is the daughter of L, so L is a parent of P.

2. P × Q: Q is the mother of P, so L and Q are P’s parents — and since Q is the mother, L is P’s father.

3. Q + R: R is the son of Q, so R is Q’s (and L’s) child too — a sibling of P.

4. R ÷ S: S is the daughter of R, so S is R’s child, which makes S the granddaughter of L and Q, not their peer.

5. Note on the family: the whole expression traces ONE continuous family — L and Q are already fixed as P's two parents (L the father, Q the mother). Since R is introduced as Q's son within this same unbroken chain (not a separate expression), R belongs to that same couple, so L is R's father too, not just Q's.

Cross-check: evaluate each statement against this family tree.

• ‘S is the wife of Q’ — false; S is R’s daughter, so she is Q’s granddaughter, not Q’s spouse.

• ‘P is sister of R’ — true; P and R are both children of L and Q, and P is the daughter, so she is R’s sister.

• ‘R is the son of L’ — true; R is Q’s son, and since L and Q are fixed as the same couple throughout this one continuous chain (L and Q are already P’s parents), R is L’s son as well.

• ‘Q is the mother of R’ — true; decoding ‘Q + R’ directly gives R as Q’s son.

Since the question asks for the statement that is NOT correct, the answer is ‘S is the wife of Q’.