Read the information given below and answer the questions that follow: In a joint family of seven persons L, M, N, O, P, Q and R, two are married couples. “R” is a housewife and her husband is a lawyer. “N” is the wife of “M”. “L” is an engineer and is the granddaughter of “R”, and “O” is the father-in-law of “N”, a doctor, and father of “P” a professor. “Q” is L’s brother and M’s son. How is P related to M?