Difficult to say. The medium said there were many spirits there that were trapped in their memories...but, at times, became aware that they had passed on. She also said that some children had been treated badly and that any young children coming into the house were protected by these trapped sprits. She said that there was an evil presence there and that it moved about the house through the vents. Another medium stated that there was an evil female presence there who lived in the small room under the stairs. It was understood that these were two distinct entities but that the one in the vents was likely to have never been human and was drawing its power from the lady under the stairs. The slave spirits communicated to the first medium that because of all the suffering that had happened there, no one would ever be able live in that house happily.
Interesting and not surprising.
However I believe any haunted home can be calmed and spirits there sent onward.
Some are just more difficult than others.
Many angry spirits will resort to using religion and the belief in the Devil as a means to frighten.
They will go to great lengths to drive away unwanted residence(s).
Communicating with a spirit in any haunted place does not require any psychic or medium.
Spirits can hear thoughts.
Thinking out loud will draw their attention and they will hear them.
As such they know if one is fearful or not.
Good communication goes a long way.
Even the most troubling ones will listen....eventually.
IMHO