This guide from ICU Steps, contains advice and information about intensive care. It tells you how critical illness may be treated and what recovery may be like. Not every patient will experience all of these things, but they are more likely to if they have been in intensive care for more than a few days.
Most of this guide is written for patients but there is a section specifically for relatives and visitors.
By reading the guide, relatives will learn what a patient's recovery may involve and it will give them the answers to some of the questions they may have.