In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.
‘A 4 B’ means ‘A is mother of B’, ‘A 6 B’ means ‘A is wife of B’, ‘A 8 B’ means ‘A is son of B’ and ‘A 2 B’ means ‘A is father of B’. Which of the following represents F as the grandson of V?