How is W related to mother of Z?

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Question

Answer the questions based on the information given below. There are seven members in a family (T, U, V, W, X, Y and Z) which consists of three generations. There is only one married couple in the family. The least number of persons in the family is only in 3rd generation. T is the only son of U, who has three children. Y is the brother in law of V, who is father of Z. X is the paternal aunt of W. Z is not the mother of W.