Correct Answer: D & S # K % Z @ U

Solution : Given:
A # B means A is the sister of B.
A @ B means A is the husband of B.
A & B means A is the brother of B.
A % B means A is the son of B.

Let's check the options –
First option: D & S # K % U @ Z
According to the given information, the family tree will be –

From the above diagram, U is the father of D.
Second option: D % S # K & Z @ U
According to the given information, the family tree will be –

From the above diagram, U is the aunt of D.
Third option: D & S # K % Z @ U
According to the given information, the family tree will be –

From the above diagram, U is the mother of D.
Fourth option: U & S # K % Z @ D
According to the given information, the family tree will be –

Here, the quadrilateral represents the male and the circular figure represents the female in the figure. From the above diagram, U is the son of D.

Hence, the third option is correct.