Supporting a Loved One Struggling with Addiction

As-salamu alaykum. If someone in your family, like a brother, is caught up in using cannabis every day, and it's been over a week now, it can be really hard. My family and I keep turning to Allah with dua, but he just doesn’t want to get help. He had quit before but fell back into it. We’re all living together and feel stuck, not sure what else to try. Has anyone dealt with this? How did you guide them back to the right path and help them find peace in their faith? Any practical advice would mean a lot.