Hi S., I am sooo sorry that you are going through this sad and stressful time. I can identify with you totally. I went through the same thing with my daughter, when she was 4. As parents, one of the best and most important things we can do for our kids, is to prepare them for the real world so they are able and confident to handle just about anything.
Death is one of these things that we have to help prepare them for (because you never know WHEN they will experience a serious loss).
Simple explanations are always best (I usually try to end it on a positive spin). When it is an all-around bad situation..ie. someone young, or unexpected. I just tell my kids that God knows EVERYthing, and we don't. He knew what was going to happen to that person in the future. It could have been MUCH worse and had more suffering. Or maybe they wouldn't have went to heaven. That God is merciful and we'll understand all the reasons when we get to heaven. When you're done talking to them, ask them if they have any questions. Also, tell them if they have any other questions, or just want to talk about it, to come to you.
When I was 4, I went to my first funeral. So, I knew what death was, and was not terrified of the unknown (kind of like the boogeyman). I did this with my daughter and it's really worked for her. A friend of mine did the opposite and mostly let her daughter experience "happy" things. Her daughter was always afraid that something would happen to her mom and family and had death dreams.
My daughter's great grandma, and grandpa died within a year of each other when she was 4. I took her only to the visitation. I told her that we were showing our love and respect for her great-grandpa and we were also saying goodbye. I explained to her ahead of time, that she would see people crying (because they missed their loved-one). That this was normal. Kind of like when she cries, but then feels fine later on. We drove and talked about her grandpa, and I explained which relatives would be at the visitation.
When we got there, we walked up to the casket together.
I cried. She was curious and quiet, but fine. Then we spent a little time talking, and visiting with relatives/friends. Before we were going to leave, I told her that it was time to say goodbye (like at a funeral). We walked up to the casket. I said what I usually say...we love you, miss you (as I'm crying), and we'll see you in heaven someday. My daughter said bye grandpa, I love you. She was fine, after.
My daughter is 13 now, and doesn't even remember going. It made her feel better, when I told her that she went to the visitation, told grandpa she loved him, and said her goodbyes. She had closure both times. She's never been pre-occupied with death, never had any nightmares about death, or dead people.
Also, for the people who are happy that their parents protected them from the life experience of seeing a sick, hospitalized, or dying loved-one. How selfish is that?
What about the person that is ill, in the hospital or dying? Maybe THEY would like to say goodbye or be comforted by the presence of all their loved-ones. It is VERY hard, scary and lonely to be in a hospital and/or dying. If you do bring children to a hospital, or to see someone ill or dying. Just keep the visit brief. Give them that last chance to tell the person that they love them and/or goodbye before you leave. This teaches them compassion and gives closure.
Hope this helps. I know both sides of the coin because I'm going to be a hospice nurse.
I'll be praying for you,
A. (;
p.s you won't scare your son by explaining all this to him. Explain that his other grandparents are healthy right now, and that there are people that live till over 90 or 100.