Talk to Psychiatry on Mental Disorders

Hi, I am asking on behalf of my brother. He is 28 years old. From last 2-5 years he got aggressive, fighting with family members without any reason. Last year he got married now he is having fight with his wife for no reasons but he always try to do it on extremist level beating her, using abusive language. After few days of fight he get normal like nothing happened in past. But when he fights or getting aggressive he gets extra energy. Some time he pretend like a zombie or Jin is coming in his body making some sort of animal noises. Obviously he never accept that he’s having any physiological problem so he doesn’t want to go and see any doctor. We are talking some sort of homeopathic medicine for him but it’s really hard to give him because he never accepts that he’s a patient. Is there any way of treatment where we can give him home session or any remedies?