Hello and welcome to Healthcare Magic. Thanks for your query.
I understand your concern for your brother's problems. From the brief description of his symptoms, it appears that he may be suffering from a psychiatric disorder, probably a psychotic disorder
. However, he needs a detailed evaluation and psychological assessment to arrive at a definitive diagnosis.
Since, you say that he gets violent and may be putting his wife and baby at risk, I would strongly suggest that you take him for teatment. Sometimes, if he is refusing treatment or is uncontrollable, he may have to be admitted and treated against his wishes. There are effective treatment options - in the form of medication and psychological therapies which can control his problems.
Wish you all the best.
Dr. Jonas Sundarakumar