S is the father of W. D is the only sister of W. R is the mother's mother of D. L the mother of P and married to S. How is P related to W?

Given: 

S is the father of W.

D is the only sister of W.

R is the mother's mother of D.

L the mother of P is married to S.

P is Brother of W.

Thus, correct option is (c).