My father had a massive heart attack last summer and was in a coma for a week. It was sudden (obviously), and in another state, so I initially went by myself until he awoke. Then I came home, packed up the kids and returned for the weekend. I did a lot of prep with the kids re; IVs, frailty, etc. They were somewhat frightened, and fortunately he lived through it, but I was glad I took them. I will always remember that I was not allowed to see my grandmother just before she died and that I was not allowed at either her or my grandfather's funerals. I think we make death too taboo for children rather than just allowing them to experience the good and bad of it. There is so much closure involved in that, even though it does mean lots of questions and sadness, and sometimes fear. So my two cents worth is that yes, you should take them.