Explanation:

- Let's decipher the relationships:

- S is a daughter of Q, and Q is married to U.

- U is the brother of P. Hence, Q is P's sister-in-law.

- P is the father of W and X, making W and X siblings.

- X is a son of Y.

- V is the son of R. R is married to S's brother.

- Couple 1: Q (wife) and U (husband) are a couple.

- Couple 2: P (father of W and X) and Y (mother of X) are a couple.

- Couple 3: S (daughter of Q) and R's brother-in-law (S’s brother), making R married to S's brother.

- These highlighted points reveal there are three couples in the family.

The correct answer is Option:4 - Three.

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