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. Who is mother-in-law of R?