Hi and welcome,
Unfortunatly, you must, as hard, difficult, and hurtful as it is, let him go off the deep end himself. Not until he admits he needs help, or asks for it can anything be done. He'll continue to hurt those that love him most, drain the wallets and resources, and lie, be abusive, and hateful all the while. Your family can find support for understanding, gaining strength, and learning how to set boundries in the fellowhships of Alanon and Naranon.
Please visit our Friends and Family forum, to see how others deal with this in their family.