My children are grown, 18, 21 and 23. They are all out of state in different colleges. When I found out about the stenosis (they've always known of my heart defect and its potential to tank) 2 years ago, I told them pretty quickly. They hadn't actually yearned for any information until I got the go ahead, recently, to see a surgeon. Now, the oldest is offering me advice on which valve!!
I am coming up on my surgery and we aren't sure if they will be able to be here for it. I'm in somewhat of a quandry about that, so I sympathize with your querry. I suggested that they didn't need to see me with all those tubes and all, and they reminded me that 9 years ago they went into ICU to visit their grandfather after his triple by-pass and while it was memorable, it was not upsetting since they knew by then that he was fine. Better, actually, than he would have been.
Perhaps the hospital has information for you. I know that they offer tours for some hospital stays, perhaps a hospital tour prior to the event would help them feel more comfortable in that environment. At that time, machinery and particulars could be identified. The hospital should also have some kind of counselling department -- they might know of some references for you.
Our site has a resouces list on the first Forum page. Perhaps some of the ideas listed there will be of help to you.
I'm sure that whatever you manage to come up with will be the right thing for your family. Your effort, mutual compassion and caring will carry you all through just fine.
Marguerite