Fogg, your last post is spot on with what I have been thinking. I do not want to lie. I also don't want to blame or overburden with too much information. What I worry about is:
a) giving too little information - I may not have all the details yet, but I don't want to wait until I do.
b) how to respond to their response. I don't have a clue what the kids will say.
c) making the kids feel like they have to cheer me up. It is not their responsibility to be my therapist.