In each of the following question, a question is followed by information given in three statements. You have to study the question along with the statements and decide the information given in which statement(s) is necessary and sufficient to answer the question. In a family of seven members, how is P related to Q? I. M and N are children of O, who is the wife of P. II. A, the cousin of B, is the niece of M. III. Q is the only brother-in-law of B.