Answer the questions based on the information given below. There are only seven members - L, M, N, O, P, Q, and R in a family of three generations. Q is the brother of P. P is the son of O, who is the son of L. M is the mother-in-law of O. R is the daughter of N. N is married to neither L nor M. Which of the following statement is/are definitely true?

• I There are two married couples in the family. I
• I N has three sons. II
• I O is the uncle of R.