How is S related to T?

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Question

Answer the questions based on the information given below. Eight persons M, N, O, P, Q, R, S, and T belong to a family of three generations. There are three married couples in the family. Each married couple has at least one child. No single person in the family is a parent. O’s mother’s sister’s husband is Q. P is married to father-in-law of Q. T is only grandson of M. R is husband of N.