How is R related to S?

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Question

Answer the questions based on the information given below. There are seven members R, S, T, U, V, W and X in a family which consists of three generations. There is one married couple in the family. X is the sister of V’s mother’s father. S is the niece of X. V is a male member. W is the only daughter of U. T is a female member and has no son. T is married. S has a sister. T is not in 3rd generation.