How is K related to F?

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Question

Answer the questions based on the information given below. Eight persons Z, J, H, K, D, F, V, and Q are there in a family of three generation. There are only two married couples in the family. Z is the only daughter of J, who is grandfather of D. D is the only son of V. Q is the brother-in-law of V. V doesn't have any siblings. H, who is unmarried is the brother of Z. F is the daughter of Z. K is not the sister-in-law of H.