How is P related to mother of S?

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Question

Answer the questions based on the information given below. There are seven members in a family (M, N, O, P, Q, R and S) which consists of three generations. There is only one married couple in the family. The least number of persons in the family is only in 3rd generation. M is the only son of N, who has three children. R is the brother in law of O, who is father of S. Q is the paternal aunt of P. S is not the mother of P.