Getting sober is an ongoing process which requires not only strong will power and a professional help, but also help from closed family.
One way to help your loved ones is finding good detox facility. Start by learning about their addiction and the different treatments available. If they’re open to it, offer to visit the place with them. Offer your help with anything that gets in the way of sobriety. Just don’t push anything! There’s no good in forcing an individual to seek treatment, one has to decide this alone.