Correct Answer: P × Q ÷ R

Solution : Given:
A × B means that A is the father of B.
A ÷ B means that A is the brother of B.
A – B means that A is the mother of B.

Let's check the options –
First option: P ÷ Q × R
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, P is the paternal uncle of R.
Second option: P × Q ÷ R
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, P is the father of R.
Third option: P × Q – R
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, P is the grandfather of R.
Fourth option: P – R ÷ Q
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, P is the mother of R.

Hence, the second option is correct.