Correct Answer: J is the mother of S

Solution : Given:
A # B ⇒ A is the husband of B
A @ B ⇒ A is the sister of B
A & B ⇒ A is the mother of B
A % B ⇒ A is the son of B

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.
Now, let's check the options –
First option: K is the father-in-law of N – From the above family tree, it is evident that K is the father-in-law of N. So, this option is correct.
Second option: R and T are brothers – From the above family tree, it is evident that R and T are brothers. So, this option is correct.
Third option: Z is the sister of T – From the above family tree, it is evident that Z is the sister of T. So, this option is correct.
Fourth option: J is the mother of S – From the above family tree, it is evident that J is the mother-in-law of S. So, this option is incorrect.

Hence, the fourth option is correct.