V's son Z is married with C whose sister X is married to E the brother of Z. How X is related to V?

Showing towards Gargy, Nelson says, "I am the only daughter of the only son of his grandfather." How Nelson is connected to Gargy?

1. W5V means W is the father of V
2. W9V means W is the sister of V
3. W4V means W is the brother of V
4. W3V means W is the wife of V

Which of the following means X is the mother of P?