It's completely situational dependent. If I have time, I'll share everything to the best of my knowledge. Remember, the loved ones may very well be making end of life decisions. Additionally, it's a good way to judge just how much the family, especially if kids are present, know about what's going on.
Example: When I was in 3rd grade, my mother had 2 strokes and ended up on a ventilator in the ICU for a month and it was really touch and go for a while (my father was seriously considering withdrawing life support for a time). Now generally, 8-9 year olds aren't allowed in the ICU for generally understandable reasons, however my father was able to talk the nursing staff into letting me in (that man can talk his way into Fort Knox). When we were getting ready to leave I was waiting just outside the door the the room for my dad to finish up and the nurse started to ask me what each of the machines did to judge how much I could understand. Being a faithful watcher of Rescue 911 (yea, go ahead... laugh ), I could describe what basically each thing was doing. Because of that, that RN went to bat the next day when that charge nurse wasn't going to let me in with my Dad.