It’s only one method of many, check other methods in Malcolm Fraser, Self-Therapy for the Stutterer. Maybe it will not cure you, but in combination with other methods, it can help you to speak more fluently. Another side is ethical, did your father cured his stuttering to be allowed to press on you by this method? They also people, respect them because they are your parents, but they also can be wrong. Maybe in your situation better to leave them and start to make your own life and your own decisions.