Explanation:

Let’s break down the information step by step:

- R is married to Q.

- R is the father of S.

- Q has one daughter and one son (so S and another child).

- T is the sister-in-law of U (who is female).

- S is not married to T.

- P is the daughter of S.

Explanation:

- R (m), Q (f): Married; their children are S and one more (because Q has one son and one daughter).

- U is female, T is her sister-in-law ? T is married to U’s brother.

- S is not married to T, so S is not U’s husband.

- P is daughter of S.

So S (child of R and Q) is married (since P is his/her daughter), but not to T. T must be married to the other child of R and Q (the other son or daughter). If S is the son, P is his daughter, and S’s sibling (who must be male or female) is married to T.

Since T is not married to S, but is S’s sibling’s spouse, S is the sibling of T’s spouse = brother/sister-in-law.

Options:

1. Cannot be determined

2. Brother

3. Sister

4. Brother-in-law

5. Sister-in-law

So, the correct answer is:

Option 4: Brother-in-law