P's son Q is married to R, whose sister S is married to T, the brother of Q. How S is related to P?
Sister
Daughter-in-law
Sister-in-law
Cousin
None of these
Since T is the brother of Q, P is the father of T. But S is the wife of T.
Hence, S is the daughter-in-law of P.
How is N related to K?
I. N's brother is married to D.
II. D's sister is married to K.