Answer the questions based on the information given below. There are seven persons- M, N, O, P, Q, R, and S, in a family, which consist of three generations and two married couples. No single member in the family is a parent. S is the only brother of N. M is mother of R. Q is maternal uncle of P. N is father-in-law of O. O doesn't have sibling   How is P related to O?