I guess your neighbors are lucky to have such a concerned friend. It is always sad to see families break up, perhaps in this case it is
the alcohol problem that needs addressing first. Maybe you can
persuade them to seek help with that.
I'm afraid here in the Forum we don't normally recommend specific retreats, however perhaps you can suggest to your neighbors to ring our 24/7 Help Line on 1300 22 4636 which may be able to advise what support services are available in your area.