S.H.
Well.... even if it is hard for your Fiance too, there is a "pecking order" so to speak. And the Wife of the Man in the hospital, is first.
How is SHE doing? She will be a Widow...
Then, the immediate family is also first, regarding what THEY need and wish for, upon a death. Not the friends. Even if the friend is like family.
And I guess, your Fiance considers himself like family, and he is considering they have all been BFF's for 20 years.
Still, he is not immediate family, AND this is not "His" Dad, that is going to die.
So no matter what, he does have to respect that, and the immediate family's need, for privacy.
*My late Dad was ill before he died. And in and out of the Hospital.
The last thing I wanted, was to have other people lingering around our home, or the hospital, no matter how well we knew them. Even if it was relatives.
All I wanted, was to be left alone, with my own Spouse and family. That's it.
Also, because my Dad was in the ICU of the Hospital, ONLY immediate family, could visit him anyway. It is very restrictive, about who can visit.
AND, as a family, they can request "no visitors" besides family.
For me, I knew my Dad was going to die. I was there before he died and when he died.
The LAST thing I wanted, was to have a non-family member, lingering around the room when my Dad died. It is a private matter. Very intimate and private. I had NO idea, when exactly my Dad was going to die. I just knew that he would die. And, even my Mom, ONLY wanted immediate family there.
So, I can understand this situation. Because I lived it.
There are Boundaries, at times like this... no matter how long you have known someone and no matter how close you are.
But, your Fiance has a sense of loyalty to them and closeness. He knew them for over 20 years. But so, If that were my Fiance... and I knew that about the family's wishes.. I, would talk to him.
Of course.
You can just say you are wondering about it. You don't have to tell him that someone else told you that. He may get hurt feelings.
And yes, emotions are always changing at times like this. Every given moment... it can change.
But ultimately, when there is a death or someone is ill and in the hospital dying, a person will say "let me know if you need anything... " to the family... And It is then up to the family of the deceased/or hospitalized, to decide, what help/when they want help and if they want company.
Friends/other relatives, should not become a focal point.