This is a new model for grieving that is taught in addition to Kubler Ross and The 5 Stages of Grief as well as WIlliam Worden's Tasks of Mourning
When a loved one dies sometimes we slowly find ways to adjust and redefine your relationship with that person, In the book Continuing Bonds: New Understandings of Grief (Death Education, Aging and Health Care) allowing for a continued bond with that person is healthy and should be allowed to endure, in different ways and to varying degrees, throughout our lives. This is a good extension to the other models already in place. Instead of grief having a beginning and end, we evolve a new relationship with our loss and how it is molded into our identity
I don't understand the term "redefine your relationship" with the departed. A relationship is a two-way street. When they are gone, it's gone. All one has left is you are alone with your thoughts about that person and your memories. That's all that can be worked on. And perhaps a new relationship with surviving relatives.