Explanation:

- R * S # T & V: R is younger than S, S is daughter of T, T and V are siblings.

- S & R $ P @ Q: S and R are siblings, P is parent of R, P and Q are together.

- T * V: T is younger than V.

- U % S: U is the wife of S.

- P % Q: Q is the wife of P.

- X & W $ R: X and W are siblings, W is the parent of R.

T is the sibling of V, who is the parent of S. S, being the sibling of R, is the daughter of T. Therefore, T is the grandparent of P. If T is S's father, P is their grandchild. Therefore, T is related to P as a grandparent.

Given options:

- Option 1: Son - Incorrect

- Option 2: Daughter - Incorrect

- Option 3: Grand daughter - Correct

- Option 4: Grand Son - Incorrect

- Option 5: None of these - Incorrect

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