Dear sister1,
I am so sorry to hear about your sister - this must be such a difficult time for you. I spoke to our Helpline about your question and they gave me this advice.
The grief response is directly proportional to how central the person who is dying is to your life. It is true that your co-workers will be experiencing some degree of grief, but not with the same pain and intensity you must be feeling it.
Perhaps the hardest people to deal with are those who think they understand because they are grieving. In this case it is good to remind colleagues that this is not another colleague you is grieving, this is your sister! Your loss is going to be beyond just a working relationship loss. Your losses will be multidimensional.
You will sometimes need to remind colleagues of your fragility and ask for their support and understanding, without expecting them to understand this need.
Mal & Dianne McKissock have written a wonderful book: "Coping with Grief"
http://www.bereavementcare.com.au/books/coping_with_grief.htm
We do have a couple of copies in our library which we could send out to you on loan if you would like.
We also have a resource: "Working with cancer" which is on CD. Perhaps you would like us to send her a copy to give to your colleagues.
www.cancercouncil.com.au/workingwithcancer
Best wishes,
Louisa