A $ B means A is mother of B

A # B means A is father of B

A @ B means A is husband of B

A % B means A is daughter of B

Which of the following expressions indicates that: P is the sister of Q?

P % A @ S $ Q

↑ or ↓ ⇒ Upward or downward line shown "generation gap" .

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation in same generation other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒ Plus sign shown " Female".

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ATQ,

The 2nd option is satisfy the equation.

Therefore, 2nd option is correct.