Answer the questions based on the information given below. There are nine persons P, Q, R, S, T, U, V, W and Y are in a family of three generations. No single person in the family is parent. The one, who is married to U is the father of S. S's sister is married to Y. V is the son-in-law of P. V's spouse has a brother. R is the aunt of T's mother. T has a brother-in-law. W is not female. The gender of Q and S is different. Q is not the granddaughter of R's sister. How is P related to S?