Question

P and Q are married couple. X and Y are brothers. X is the brother of P. How is X related to Q?

Answer 1

brother -in -law
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Answer 2

Although we know that P and Q are married, we do not know who is the male and the female. Therefore, P can be related to X in two ways. In other words, P can either be a sister to X or P can either be a brother to X.

If P is a sister to X, then Q is sister’s husband to X. This means Q is a brother-in-law to X.

If P is a brother to X, then Q is brother’s wife to X. This means Q is a sister-in-law to X.