Explanation:

- R is the son of P and the only sibling of S. This makes R and S brothers.

- Q is the mother of S, indicating that Q is also R’s mother.

- T is the sister-in-law of S, making her married to R.

- T is the mother of V, so V is the child of R and T.

- V is the nephew of S, confirming that S is V's uncle.

- U is the wife of S, indicating S is married to U.

- U has no siblings.

Therefore, S is V's paternal uncle, as V is the son of R, who is S's brother.

So the correct answer is:

2. Paternal Uncle

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