There were a few other things I wanted to share, but I didn't want to post them too early. Let you take the best each day could give you as each day came. But now that you are facing the final end.
Have you talked to the hospice nurses about what the final days and hours will look like? My Mom, was the first time I had to watch someone dying. And I didn't know what it would look like, or more importantly what it would sound like. When the body shuts down, respiration changes and as unsettling as everything before was, that was even more so. Since you have kids who are old enough to recognize the difference, consider having a family talk (just you, and them, and other adults who might be there) about who wants to be there at the very, very end. If anyone.
My Mom passed overnight, and we weren't there. When we left hospice that evening, my Dad, husband and I talked about should we stay or go. And we all decided that we were there for her as much as we could, but leaving we had to do for us. Because the only thing we could imagine that would be worse than what the final few hours were, was experiencing the moment where it ended. That was a memory we chose not to have. But for some people, it's very important for them to be there, as a previous poster said, "so their loved one could die in their arms." I just wanted to post that it's okay, not to want to have that memory.
As we were driving back to the house that night, my husband and I were in one car and my Dad in another. On the drive home, there was the most beautiful intense sunset that I had ever seen in the area where my parents lived. I commented on it to my husband. When we got to the house, my Dad asked if we noticed the sunset. My Mom loved sunsets. So I choose to believe that that was her goodbye, and she understood.
There is no right way to do this, and you are doing a beautiful job. Many hugs to your family.