1) take care of your mom
2) turn off the TV or change it to something else. All that constant crap on FOX, and other "news channels" will piss anyone off.
3)Have a come to Jesus with him. Tell him to straighten up or there will be consequences all the way up to moving him into a home.
If you can, record some of the stuff he is doing so you can show it to the doctor. He may be able to help as well if he know the true picture.
