My heart is with you and your Mum right now. There is nothing anyone can really say that will make this better. It's so unfair. I was 29 when my father died suddenly from complications after a simple operation. Awful when you are so young to deal with the loss of a parent. I know how you must be feeling - angry, cheated, alone, lost.
You are doing the right thing in your idea of a global email. All you need is your brothers and father around you and your mum. This is so hard on you all. You are a wonderful daughter. My thoughts are with you.
Love Janey xxx