|A) Husband||B) Father|
|C) Brother||D) Uncle|
Answer: C) Brother
Q is the son of R but R is not the mother. So, R is the Father of Q. P is married to R
So, P is the wife of R and the mother of Q, X is the daughter of P and hence of R and so she is the Sister of Q, Y is the brother of R and Z is the brother of P.
X is the sister of Q who is a male. So, Q is brother of X.