Hi ginnyrae!
Welcome-
I have alcoholic brothers and over the years I have had periods of no contact, periods of "loving them from afar" via postcards and letters...and periods of interacting with their insanity. The thing I try to remember is it is my choice - it is a choice - who I allow in my life. If a person is completely toxic and dangerous - it doesn't matter that we share DNA...I protect myself and my family first.
It must be hard that you are his last remaining blood relative, but never forget it is his choices that make a relationship impossible, and he has the right to live how he wants to live - it's his destiny he is fulfilling, as sad and strange and wasteful as it may seem, it is his to own and do with as he sees fit.
I know many times guilt has crept in and prodded me to reach out and I'd get burned. *sigh* One day at a time.
AlAnon helped me enormously.
peace-
b