Read the following information carefully to answer the questions given below it. 
(a) 'A +B' means that 'A' is the father of 'B' 
(b) 'A — B' means that 'A' is the wife of 'B' 
(c) 'A x B' means that 'A' is the brother of 'B' 
(d) 'A =B' means that 'A' is the daughter of 'B' If it is given 'P R + S + Q', then which of the following is true ?