It becomes a hobby. Naturally there are religious requirements for some that practice ancestor worship and would erect a shrine in the home, but if that is not the case with your family member, there is cause for concern. I'm not the one who died. I'm still here. This chronic lack of focus builds resentment and often makes survivors feel as though they are competing with a ghost for just a small slice of attention.
Memory is an interesting thing.
It is the result of events being sifted through the prism of time and love, and a need to never erase a loved one from our thoughts. Memory can be used either as a bridge or a wedge. One of the greatest tributes we can pay to the deceased is to keep on living. To remember those who have gone before us with honor and dignity is to be commended, but there must be a sense of proportion. When all efforts are being expended on the ongoing project of memory, whether or not it is realistic, there is little if any room for the living.