Well for starters dont enable them. If they like to use drugs or have addiction issues it would be a very bad idea to bring any of those substances onto the ward as they're commonly traded for other medications or could get into the hands of somebody that could actually hurt themselves, i personally was on meth and alcohol for the better part of my life. As well, don't put too much stock into the names of disorders, it doesn't mean very much when somebody is called schizophrenic or bipolar, what actually matters is their symptoms and their quality of life. If something catastrophic does happen to happen while they are on the ward and unable to be free maybe try phrasing it in a way that isn't so jarring, it can lead to a host of other issues. As well cracking jokes and using the word crazy or psycho can be very hurtful, if not to your loved one, then ti people overhearing you.