I was close to my grandma. She had liver issues and passed away when I was about 10 or so. She was in the hospital and we all knew she was going to die. Everyone got to go in and see her. Everyone except for me because my parents didn't want me to see her like that. They wanted me to remember her the way she was. Looking back, it was the wrong call. I'm 34 now. My imagination can fill in the gaps and I see her hooked up to machines (even though I didn't actually see her that way). So that didn't work out too well. But I did miss out on being able to say bye. It's not a source of contention in our family, but from that experience I won't try to shelter my children. I'll be there to teach them and help them work through the realities of life and death.
Good luck on your decision.
clean as a whistle