You don't ever remind a person with dementia about the passing of their loved one. It might hurt you to know that they don't remember. Maybe you need the closure of grieving with your loved one who has dementia. But they will not remember that tomorrow. To remind them is to torture them. Think about the first time you learned a loved one died. Think of the pain in that first moment. Every moment after that is slightly less painful. Nothing is like hearing it for it the first time.