How is M related to J?

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Question

Answer the following questions based on the information given below. There are eight members, H, I, J, K, L, M, N, and O in a family which consists of three generations. No single person in the family is a parent. I is the paternal grandfather of L. L is the only brother of M. M is married. K is married to N. N is mother-in-law of H. O is daughter of J. O has a niece.