Can you help me with a Meth problem?

Hello! I'm having this problem that I need help in; maybe you guys can help me. This problem has been going on for a while (6 years), my uncle who has been living with us since he was a teenager is a Meth user/addict, and its been destroying our family with fights between my parents and my uncle. We have tried helping, but he's always refusing the help or just lies that he isn't doing any drugs. My parents are in the brink of divorcing because of this , but since my mom recently lost a sister, she doesn't want to lose another family member. In truth, even though I hate him when he is high, my uncle is a pretty cool person when he is sober. I don't want to see this person die. Do you guys have any suggestions on helping him kick the habit? I will really appreciate the advice. Thanks!