How is N related to O?

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Question

Answer the questions based on the information given below: There are six members L, M, N, O, P and Q in the family of three generations. No single parent has a child. There are two persons in each generation. P is father-in-law of O, who is not married to N. N and Q are siblings. M, who is not married to P, has only one daughter. M and L have same gender.