Maybe tell them how to create a living will.
"Now, now, Mrs Smith. I know you miss your (recently departed) husband & your gout hurts terribly. While I have you here, I'd like to go over some paperwork. I notice you don't have a living will. You wouldn't want to suffer at the hands of an uncaring staff in some broken down medical facility, in the unfortuante case of, God forbid, a terrible & tragic, perhaps disfiguring, accident, would you? Your children shouldn't be responsible for such a horrific decision at an stage of suffering, do you think? I know I'd not want it. Fill in you name here, oh, never mind, we can do that, just sign here & initial here & here, then we can take care of you. We'll make sure you don't suffer."