How is J related to G?

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Question

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