Stages of grief

The stages of grief are well researched, it seems they are a common list that many people could concur, occur.
My brother has been dead for a very long time. What stage of grief am I in?
I'm also grieving for other relationships, one with my dad...
He's not dead but he's not here anymore, a zombie in fact.
Celebrating the joy we had, for the longest time I couldn't see the good.
Why do you think that is, is that the loving dead version of grief?