So if you die in the house you get your spirit gets trapped in the house, Contance wanting Larry to finish killing the Armenian guy elsewhere so he would be another spirit in the house. I guess on Halloween your spirit can leave the house, Tate going on a date with Violet for instance and Moira going to see her mother.
I wonder though if your remains have to be on the property to be attached to the house? It seems that is Moira case with her bones buried in the back yard. I can't imagine all the other ghosts we have seen are buried there beyond Moira, Hayden and the burgurlar trio.