How is A related to H?

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Question

Answer the questions based on the information given below. There are eight members (A, B, C, D, E, F, G and H) in a family, which consists of three generations. No single person in the family is a parent. There are four married couples in the family. C is sister of A, who is son of F. D is only grandson of B. Both H and E are in the same generation. H doesn’t have any child. B, E and G are of same gender.