Explanation:

- S and V are a married couple. Since S is the mother-in-law of U, S must be a female.

- V must be male because he is married to S.

- W is the grandson of V and therefore the grandchild of S.

- V has two children; one must be the parent of W.

- U is the sister-in-law of Y and also married to one of S's children.

- X is the brother-in-law of S, meaning he is V's brother.

- Y is unmarried, implying U is married to the child who is not Y.

From the above points, T is the only remaining option for being the father of W, as both children of V are linked except for T.

- Option 2: T is the correct answer.