I have questions about my brother allownc which is...

If your brother was working in a company in the UAE, then he passed away and the company did not pay his financial dues, then in this case you can file a complaint with the Labor Office of the company’s headquarters, where you can get the end of service benefits and vacation pay that he did not get during work
Also, please note that in the event of the death of an employee while he is in service, the government agency to which he is affiliated shall pay his total salary that was paid to him for the month of death and the following three months in one payment to the person appointed by the employee. And if none of them is found, it will be distributed among his legal heirs according to the legal shares.