How do I go about in successfully ataining a court order to give an adult involuntary treatment?

Hi, my brother is 21 and is in need of psychiatric help. We spoke to him on seeking treatment but he refuses. He was given medication for his episodes, but since he takes them with alcohol, it's no help. Our mother wants for him to receive help in a facility called crossroads health with the help of a court order. He still continues with his paranoia and hallucinations. He used to break walls and ceilings in anger when he was younger but he got to scared to do that when he began hearing the voices. We do have videos of him during these episodes since he claimed they did not happen when he was taken to the hospital for help.