<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello sir, actually the problem is with my brother-in-law . he is a man with dual personality. wth family memebers and his office staff he is diff. but wth his wife he is tatally a negative man. even though they had a love marriage. he even beats his wife sometimes and do asked her to do odd things always.  <response>: Degree understand your concerns went through your details. I suggest you not to worry much. Wrong assessment always leads to disaster. From the given symptoms, it is very difficult to diagnose. You should not try to label a person as having multiple personality disorder. He could just be a normal person with negative mind set. Any way, consulting a psychologist and undergoing a psychometric test to diagnose the psychiatric disorder should prove good for your brother-in-law. Psychotherapy techniques should suit your requirement. If you require more of my help in this aspect, Please post a direct question to me in this URL. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques. Hope this answers your query. Available for further clarifications. Good luck. 