A - B means ‘A is the son of B’,
A $ B means ‘A is the sister of B’,
A @ B means ‘A is the daughter of B’ and
A * B means ‘A is the father of B’.
Based on the above information, which of the following means that W is the sister's son of S?​​

A - B means ‘A is the son of B’,
A $ B means ‘A is the sister of B’,
A @ B means ‘A is the daughter of B’ and
A * B means ‘A is the father of B’.

Now, we check each options.

Option (a): W * E - A $ K @ S

From the above family tree W is the son in law of S.

Option (b): W @ E - A $ K * S

From the above family tree W(female) is a daughter of S.

Option (c): W $ E * A - K @ S

From the above family tree W(female) is the sister of E instead of the son of someone.

Option (d): W - E @ A * K $ S

From the above family tree W is the sister's son of S.

Thus, correct option is (d).