Correct Answer: P × Q + R

Solution : Given:
A + B ⇒ A is the brother of B
A × B ⇒ A is the sister of B
A ÷ B ⇒ A is the father of B

Let's check each option –
First option: P ÷ Q + R
As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure. So, P is the father of R.
Second option: P + Q × R
As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure. So, P is the brother of R.
Third option: P × Q ÷ R
As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure. So, P is the aunt of R.
Fourth option: P × Q + R
As per the given information, the family tree will be as follows –

Here, the quadrilateral represents the male, and the circular figure represents the female in the figure. So, P is the sister of R.

Hence, the fourth option is correct.