He should make his parents understand about his interests. He should make them understand that career with no interest is equal to suicide.
He should give various examples about the persons who have achieved great success in English, history or geography field.
He should make them aware about the various careers in English history or geography.
After opting for English history and geography, he can become poet or writer. He can complete his graduation by pursuing BA with history and English, then he can apply for IAS or can become professor.
Good Luck! :)