Answer the questions based on the information given below. There are seven members (L, M, N, O, P, Q and R) in a family, which consists of three generations. No single person in the family is a parent. There are only two married couples in the family. O, who is grandson of L, has one sister. M is mother-in-law of N, who is sister-in-law of P. R, who does not have any sister, is a married member of the family.
